CY54FCT543T, CY74FCT543T
8-BIT LATCHED REGISTERED TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCCS030A 鈥?MAY 1994 鈥?REVISED OCTOBER 2001
D
D
D
D
D
D
D
D
D
D
D
D
Function, Pinout, and Drive Compatible
With FCT and F Logic
Reduced V
OH
(Typically = 3.3 V) Versions
of Equivalent FCT Functions
Edge-Rate Control Circuitry for
Significantly Improved Noise
Characteristics
I
off
Supports Partial-Power-Down Mode
Operation
Matched Rise and Fall Times
Fully Compatible With TTL Input and
Output Logic Levels
3-State Outputs
ESD Protection Exceeds JESD 22
鈥?2000-V Human-Body Model (A114-A)
鈥?200-V Machine Model (A115-A)
鈥?1000-V Charged-Device Model (C101)
Separation Controls for Data Flow in Each
Direction
Back-to-Back Latches for Storage
CY54FCT543T
鈥?48-mA Output Sink Current
鈥?12-mA Output Source Current
CY74FCT543T
鈥?64-mA Output Sink Current
鈥?32-mA Output Source Current
CY54FCT543T . . . D PACKAGE
CY74FCT543T . . . Q OR SO PACKAGE
(TOP VIEW)
LEBA
OEBA
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
CEAB
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
CEBA
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
LEAB
OEAB
description
The 鈥橣CT543T octal latched transceivers contain two sets of eight D-type latches with separate latch-enable
(LEAB, LEBA) and output-enable (OEAB, OEBA) inputs for each set to permit independent control of input and
output in either direction of data flow. For data flow from A to B, for example, the A-to-B enable (CEAB) input
must be low in order to enter data from A or to take data from B, as indicated in the function table. With CEAB
low, a low signal on the A-to-B latch-enable (LEAB) input makes the A-to-B latches transparent; a subsequent
low-to-high transition of the LEAB signal puts the A latches in the storage mode and their outputs no longer
change with the A inputs. With CEAB and OEAB low, the 3-state B-output buffers are active and reflect the data
present at the output of the A latches. Control of data from B to A is similar, but uses CEBA, LEBA, and OEBA
inputs.
These devices are fully specified for partial-power-down applications using I
off
. The I
off
circuitry disables the
outputs, preventing damaging current backflow through the device when it is powered down.
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
錚?/div>
2001, 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
鈥?/div>
DALLAS, TEXAS 75265
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