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Part: SN54ACT245J
Category:
Logic
-> Bus Transceivers
Description: Octal Bus Transceivers With 3-state Outputs
Company: Texas Instruments, Inc.
Datasheet: Download SN54ACT245J datasheet File size : 214 kB
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SN54ACT245, SN74ACT245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
SCAS452D SEPTEMBER 1994 REVISED JANUARY 2000
D D D
Inputs Are TTL-Voltage Compatible EPIC TM (Enhanced-Performance Implanted CMOS) 1-mm Process Package Options Include Plastic Small-Outline (DW) Shrink Small-Outline (DB), and Thin Shrink Small-Outline (PW) Packages, Ceramic Chip Carriers (FK) and Flatpacks (W), and Standard Plastic (N) and Ceramic (J) DIPs
SN54ACT245 . . . J OR W PACKAGE SN74ACT245 . . . DB, DW, N, OR PW PACKAGE (TOP VIEW)
description
These octal bus transceivers are designed for asynchronous two-way communication between data buses. The control-function implementation minimizes external timing requirements. When the output-enable (OE) is low, the device passes noninverted data 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. A high on OE disables the device so that the buses are effectively isolated. The SN54ACT245 is characterized for operation over the full military temperature range of 55°C to 125°C. The SN74ACT245 is characterized for operation from 40°C to 85°C.
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
SN54ACT245 . . . FK PACKAGE (TOP VIEW)
A2 A1 DIR VCC
3 4 5 6 7 8
A3 A4 A5 A6 A7
2 1 20 19 18 17 16 15
OE B1 B2 B3 B4 B5
14 9 10 11 12 13
FUNCTION TABLE (each transceiver) INPUTS OE L L H DIR L H X OPERATION B data to A bus A data to B bus Isolation
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. EPIC is a trademark of Texas Instruments Incorporated.
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.
Copyright © 2000, 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.
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· DALLAS, TEXAS 75265
A8 GND B8 B7 B6
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SN54ACT245, SN74ACT245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
SCAS452D SEPTEMBER 1994 REVISED JANUARY 2000
logic symbol
OE DIR 19 1 G3 3EN1[BA] 3EN2[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 B1
logic diagram (positive logic)
DIR 1 19
OE
A1
2
A1
2
18
B1
To Seven Other Channels
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 range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 7 V Input voltage range, VI (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to VCC + 0.5 V Output voltage range, VO (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to VCC + 0.5 V Input clamp current, IIK (VI VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA Output clamp current, IOK (VO VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA Continuous output current, IO (VO = 0 to VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50 mA Continuous current through VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±200 mA Package thermal impedance, JA (see Note 2): DB package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70°C/W DW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58°C/W N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69°C/W PW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83°C/W Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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. NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed. 2. The package thermal impedance is calculated in accordance with JESD 51.
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POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SN54ACT245, SN74ACT245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
SCAS452D SEPTEMBER 1994 REVISED JANUARY 2000
recommended operating conditions (see Note 3)
SN54ACT245 MIN VCC VIH VIL VI VO IOH IOL Dt/Dv Supply voltage High-level input voltage Low-level input voltage Input voltage Output voltage High-level output current Low-level output current Input transition rise or fall rate 0 0 0 4.5 2 0.8 VCC VCC 24 24 8 0 0 0 MAX 5.5 SN74ACT245 MIN 4.5 2 0.8 VCC VCC 24 24 8 MAX 5.5 UNIT V V V V V mA mA ns/V
TA Operating free-air temperature 55 125 40 85 °C NOTE 3: 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 TEST CONDITIONS CONDITIONS IOH = 50 mA mA VOH IOH = 24 mA mA IOH = 50 mA IOH = 75 mA IOL = 50 mA 50 mA VOL IOL = 24 mA 24 mA IOL = 50 mA IOL = 75 mA IOZ II ICC A or B ports OE or DIR VO = VCC or GND VI = VCC or GND VI = VCC or GND, IO = 0 One input at 3.4 V, Other inputs at GND or VCC VI = VCC or GND VO = VCC or GND VCC 4.5 V 5.5 V 4.5 V 5.5 V 5.5 V 5.5 V 4.5 V 5.5 V 4.5 V 5.5 V 5.5 V 5.5 V 5.5 V 5.5 V 5.5 V 5.5 V 5V 5V 0.6 4.5 15 ±0.5 ±0.1 4 ±10 ±1 80 1.6 0.001 0.001 0.1 0.1 0.36 0.36 0.1 0.1 0.5 0.5 1.65 1.65 ±5 ±1 40 1.5 MIN 4.4 5.4 3.88 4.86 TA = 25°C TYP MAX 4.49 5.49 SN54ACT245 MIN 4.4 5.4 3.7 4.7 3.85 3.85 0.1 0.1 0.44 0.44 V MAX SN74ACT245 MIN 4.4 5.4 3.76 4.76 V MAX UNIT
mA mA mA
mA pF pF
DICC§
Ci Cio
Not more than one output should be tested at a time, and the duration of the test should not exceed 2 ms. For I/O ports, the parameter IOZ includes the input leakage current. § This is the increase in supply current for each input that is at one of the specified TTL voltage levels rather than 0 V or VCC.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
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