• State-of-the-Art BiCMOS Design
Significantly Reduces ICCZ
• ESD Protection Exceeds 2000 V
Per MIL-STD-883C, Method 3015
• Power-Up High-Impedance State
• 3-State Inverting Outputs
• Back-to-Back Registers for Storage
• Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK) and Flatpacks (W), and
Plastic and Ceramic 300-mil DIPs (JT, NT)
The ′BCT544 octal registered transceiver
contains two sets of D-type latches for temporary
storage of data flowing in either direction.
Separate latch-enable (LEAB or LEBA) and
output-enable (OEAB or OEBA) inputs are
provided for each register to permit independent
control in either direction of data flow.
The A-to-B enable (CEAB) input must be low in
order to enter data from A or to output data from
B. If CEAB is low and LEAB is low, the A-to-B
latches are transparent; a subsequent low-to-high
transition of LEAB puts the A latches in the storage
mode. With CEAB and OEAB both low, the 3-state
B outputs are active and reflect the inverted data
present at the output of the A latches. Data flow
from B to A is similar, but requires using the CEBA,
LEBA, and OEBA inputs.
The SN54BCT544 is characterized for operation
over the full military temperature range of – 55°C
to 125°C. The SN74BCT544 is characterized for
operation from 0°C to 70°C.
OCTAL REGISTERED TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS039B – NOVEMBER 1988 – REVISED NOVEMBER 1993
SN54BCT544 . . . JT OR W PACKAGE
SN74BCT544 . . . DW OR NT PACKAGE
SN54BCT544 . . . FK PACKAGE
4 3 2 1 28 27 26
12 13 14 15 16 17 18
NC – No internal connection
H X XX
L X HX
L H LX
L L LL
L L LH
† A-to-B data flow is shown; B-to-A flow control is the same
except that it uses CEBA, LEBA, and OEBA.
‡ Output level before the indicated steady-state input
conditions were established.
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
Copyright © 1993, Texas Instruments Incorporated