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Part: 84030012A
Category:
Logic
-> Transceivers
-> Standard Transceivers
Description: ti SN54ALS245A, Octal Bus Transceivers With 3-State Outputs
Company: Texas Instruments, Inc.
Datasheet: Download 84030012A datasheet File size : 68 kB
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Datasheet text preview:
SN54ALS245A, SN54AS245, SN74ALS245A, SN74AS245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
SDAS272A NOVEMBER 1994 REVISED JANUARY 2003
D D
4.5-V to 5.5-V VCC Operation Max tpd of 5.5 ns at 5 V
SN54ALS245A . . . J OR W PACKAGE SN54AS245 . . . J PACKAGE SN74ALS245A . . . DB, DW, N, OR NS PACKAGE SN74AS245 . . . DW, N, OR NS PACKAGE (TOP VIEW)
D D
3-State Outputs Drive Bus Lines Directly pnp Inputs Reduce dc Loading
SN54ALS245A, SN54AS245 . . . FK PACKAGE (TOP VIEW)
DIR A1 A2 A3 A4 A5 A6 A7 A8 GND
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
VCC OE B1 B2 B3 B4 B5 B6 B7 B8
A2 A1 DIR VCC OE A3 A4 A5 A6 A7
4 5 6 7 8 3 2 1 20 19 18 17 16 15 14 9 10 11 12 13
B1 B2 B3 B4 B5
description/ordering information
ORDERING INFORMATION
TA PACKAGE ORDERABLE PART NUMBER SN74ALS245A-1N PDIP N Tube Tube Tape and reel 0°C to 70°C SOIC DW DW Tube Tape and reel Tube Tape and reel Tape and reel SOP NS SSOP DB CDIP J 55°C to 125°C CFP W LCCC FK FK Tape and reel Tape and reel Tape and reel Tube Tube Tube SN74ALS245AN SN74AS245N SN74ALS245ADW SN74ALS245ADWR SN74ALS245A-1DW SN74ALS245A-1DWR SN74AS245DW SN74AS245DWR SN74ALS245ANSR SN74ALS245A-1NSR SN74AS245NSR SN74ALS245ADBR SNJ54ALS245AJ SNJ54AS245J SNJ54ALS245AW SNJ54ALS245AFK SNJ54AS245FK TOP-SIDE MARKING SN74ALS245A-1N SN74ALS245AN SN74AS245N ALS245A ALS245A-1 AS245 ALS245A ALS245A-1 74AS245 G245A SNJ54ALS245AJ SNJ54AS245J SNJ54ALS245AW SNJ54ALS245AFK SNJ54AS245FK
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 2003, Texas Instruments Incorporated
On products compliant to MIL-PRF-38535, all parameters are tested unless otherwise noted. On all other products, production processing does not necessarily include testing of all parameters.
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
A8 GND B8 B7 B6
1
SN54ALS245A, SN54AS245, SN74ALS245A, SN74AS245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
SDAS272A NOVEMBER 1994 REVISED JANUARY 2003
description/ordering information(continued)
These octal bus transceivers are designed for asynchronous two-way communication between data buses. The control-function implementation minimizes external timing requirements. The devices allow data transmission from the A bus to the B bus or from the B bus to the A bus, depending upon the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so that the buses are effectively isolated. The -1 version of the SN74ALS245A is identical to the standard version, except that the recommended maximum IOL is increased to 48 mA. There is no -1 version of the SN54ALS245A.
FUNCTION TABLE INPUTS OE L L H DIR L H X OPERATION B data to A bus A data to B bus Isolation
logic diagram, each gate (positive logic)
DIR 1 19
OE
A1
2
18
B1
To Seven Other Channels
absolute maximum ratings over operating free-air temperature range (SN54ALS245A, SN74ALS245A) (unless otherwise noted)
Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI: All inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Package thermal impedance, JA (see Note 1): DB package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70°C/W DW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58°C/W N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69°C/W NS package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60°C/W Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTE 1: The package thermal impedance is calculated in accordance with JESD 51-7.
2
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SN54ALS245A, SN54AS245, SN74ALS245A, SN74AS245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
SDAS272A NOVEMBER 1994 REVISED JANUARY 2003
recommended operating conditions (see Note 2)
SN54ALS245A MIN VCC VIH VIL IOH IOL Supply voltage High-level input voltage Low-level input voltage High-level output current Low-level output current output current 4.5 2 0.7 12 12 NOM 5 MAX 5.5 SN74ALS245A MIN 4.5 2 0.8 15 24 48 NOM 5 MAX 5.5 UNIT V V V mA mA
TA Operating free-air temperature 55 125 0 70 °C Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V NOTE 2: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report, Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER VIK TEST CONDITIONS CONDITIONS VCC = 4.5 V, VCC = 4.5 V to 5.5 V, VCC = 4.5 V II = 18 mA IOH = 0.4 mA IOH = 3 mA IOH = 12 mA IOH = 15 mA IOL= 12 mA VOL Control inputs A or B ports Control inputs A or B ports§ Control inputs A or B ports§ VCC = 4.5 V IOL = 24 mA IOL = 48 mA VI = 7 V VI = 5.5 V VI = 2 7 V 2.7 VI = 0 4 V 0.4 VO = 2.25 V Outputs high Outputs low Outputs disabled 20 30 36 38 0.1 0.1 20 20 0.1 0.1 112 48 60 63 30 30 36 38 SN54ALS245A MIN TYP MAX 1.5 VCC 2 2.4 2 2 0.25 0.4 0.25 0.35 0.35 0.4 0.5 0.5 0.1 0.1 20 20 0.1 0.1 112 45 55 58 mA mA µA mA mA V 3.2 VCC 2 2.4 3.2 SN74ALS245A MIN TYP MAX 1.5 UNIT V
VOH
V
II IIH IIL IO¶ ICC
VCC = 5 5 V 5.5 VCC = 5 5 V 5.5 V, VCC = 5 5 V 5.5 V, VCC = 5.5 V, VCC = 5.5 V
Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V All typical values are VCC = 5 V, TA = 25°C. § For I/O ports, the parameters IIH and IIL include the off-state output current. ¶ The output conditions have been chosen to produce a current that closely approximates one-half of the true short-circuit output current, IOS.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
3
SN54ALS245A, SN54AS245, SN74ALS245A, SN74AS245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
SDAS272A NOVEMBER 1994 REVISED JANUARY 2003
switching characteristics (see Figure 1)
VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 , R2 = 500 , TA = MIN to MAX SN54ALS245A SN74ALS245A MIN tPLH tPHL tPZH tPZL tPHZ tPLZ A or B or B or A or A or B or A or B or 1 1 2 2 2 2 MAX 19 14 30 29 14 30 MIN 3 3 5 5 2 4 MAX 10 10 20 20 10 15 ns ns ns
PARAMETER
FROM (INPUT)
TO (OUTPUT)
UNIT
OE OE
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
absolute maximum ratings over operating free-air temperature range (SN54AS245, SN74AS245) (unless otherwise noted)
Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI: All inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Package thermal impedance, JA (see Note 1): DW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58°C/W N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69°C/W NS package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60°C/W Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTE 1: The package thermal impedance is calculated in accordance with JESD 51-7.
recommended operating conditions (see Note 2)
SN54AS245 MIN VCC VIH VIL IOH IOL TA Supply voltage High-level input voltage Low-level input voltage High-level output current Low-level output current Operating free-air temperature 55 4.5 2 0.8 12 48 125 0 NOM 5 MAX 5.5 SN74AS245 MIN 4.5 2 0.8 15 64 70 NOM 5 MAX 5.5 UNIT V V V mA mA °C
NOTE 2: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report, Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
4
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SN54ALS245A, SN54AS245, SN74ALS245A, SN74AS245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
SDAS272A NOVEMBER 1994 REVISED JANUARY 2003
electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER VIK TEST CONDITIONS CONDITIONS VCC = 4.5 V, VCC = 4.5 V to 5.5 V, VCC = 4.5 V II = 18 mA IOH = 2 mA IOH = 3 mA IOH = 12 mA IOH = 15 mA IOL = 48 mA IOL = 64 mA VI = 7 V VI = 5.5 V VI = 2 7 V 2.7 VI = 0 4 V 0.4 VO = 2.25 V Outputs high Outputs low Outputs disabled 50 62 95 79 MIN SN54AS245 TYP MAX 1.2 VCC 2 2.4 2 2 0.3 0.55 0.35 0.1 0.1 50 70 0.5 0.75 150 97 143 123 50 62 95 79 0.55 0.1 0.1 20 70 0.5 0.75 150 97 143 123 mA V mA µA mA mA 3.2 VCC 2 2.4 3.2 MIN SN74AS245 TYP MAX 1.2 UNIT V
VOH
V
VOL II IIH IIL IO§ ICC Control inputs A or B ports Control inputs A or B ports Control inputs A or B ports
VCC = 4 5 V 4.5 VCC = 5 5 V 5.5 VCC = 5 5 V 5.5 V, VCC = 5 5 V 5.5 V, VCC = 5.5 V, VCC = 5.5 V
All typical values are VCC = 5 V, TA = 25°C. For I/O ports, the parameters IIH and IIL include the off-state output current. § The output conditions have been chosen to produce a current that closely approximates one-half of the true short-circuit output current, IOS.
switching characteristics (see Figure 1)
VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 , R2 = 500 , TA = MIN to MAX¶ SN54AS245 SN74AS245 MIN tPLH tPHL tPZH tPZL tPHZ tPLZ A or B or B or A or A or B or A or B or 2 2 2 2 2 2 MAX 9.5 9 11 10.5 7.5 12 MIN 2 2 2 2 2 2 MAX 7.5 7 9 8.5 5.5 9.5 ns ns ns
PARAMETER
FROM (INPUT)
TO (OUTPUT)
UNIT
OE OE
¶ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
5
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