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Part: SNJ54AS645FK
Category:
Logic
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-> Standard Transceivers
Description: ti SN54AS645, Octal Bus Transceivers With 3-State Outputs
Company: Texas Instruments, Inc.
Datasheet: Download SNJ54AS645FK datasheet File size : 214 kB
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Datasheet text preview:
SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
SDAS278 JANUARY 1995
· · · ·
Bidirectional Bus Transceivers in High-Density 20-Pin Packages True Logic 3-State Outputs Package Options Include Plastic Small-Outline (DW) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs
SN54ALS645A, SN54AS645 . . . J PACKAGE SN74ALS645A, SN74AS645 . . . DW OR N PACKAGE (TOP VIEW)
description
These octal bus transceivers are designed for asynchronous two-way communication between data buses. These devices transmit data from the A bus to the B bus or from the B bus to the A bus, depending on the 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 SN74ALS645A is identical to the standard version, except that the recommended maximum IOL is increased to 48 mA. There is no -1 version of the SN54ALS645A. The SN54ALS645A and SN54AS645 are characterized for operation over the full military temperature range of 55°C to 125°C. The SN74ALS645A and SN74AS645 are characterized for operation from 0°C to 70°C.
FUNCTION TABLE INPUTS OE L L H DIR L H X OPERATION B data to A bus A data to B bus Isolation
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
VC C OE B1 B2 B3 B4 B5 B6 B7 B8
SN54ALS645A, SN54AS645 . . . FK PACKAGE (TOP VIEW)
A2 A1 DIR VCC
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
OE B1 B2 B3 B4 B5
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
Copyright © 1995, Texas Instruments Incorporated
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SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
SDAS278 JANUARY 1995
logic symbol
OE DIR 19 1 G3 3 EN1 [BA] 3 EN2 [AB] 1 2 A2 A3 A4 A5 A6 A7 A8 3 4 5 6 7 8 9 17 16 15 14 13 12 11 B2 B3 B4 B5 B6 B7 B8 18
logic diagram (positive logic)
OE 19
A1
2
DIR B1
1
A1
2
18
B1
To Seven Other Transceivers
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI: All inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Operating free-air temperature range, TA: SN54ALS645A . . . . . . . . . . . . . . . . . . . . . . . . . . . 55°C to 125°C SN74ALS645A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C 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.
recommended operating conditions
SN54ALS645A 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 55 4.5 2 0.7 12 12 125 0 NOM 5 MAX 5.5 SN74ALS645A MIN 4.5 2 0.8 15 24 48§ 70 NOM 5 MAX 5.5 UNIT V V V mA mA °C
TA Operating free-air temperature § Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V
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POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
SDAS278 JANUARY 1995
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 20 30 36 0.1 0.1 20 20 0.1 0.1 112 48 60 30 30 36 MIN SN54ALS645A 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 mA mA µA mA mA V 3.2 VCC 2 2.4 3.2 MIN SN74ALS645A 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
Outputs disabled 38 63 38 58 All typical values are at VCC = 5 V, TA = 25°C. Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V § 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# SN54ALS645A MIN tPLH tPHL tPZH tPZL tPHZ tPLZ A or B or 1 B or A or A or B or A or B or 1 2 OE OE 2 2 2 MAX 19 14 30 29 14 30 SN74ALS645A MIN 3 3 5 5 2 4 MAX 10 10 20 20 10 15 ns ns ns
PARAMETER
FROM (INPUT)
TO (OUTPUT)
UNIT
# For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
3
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