Datasheet

CY74FCT2573T
8-BIT LATCH
WITH 3-STATE OUTPUTS
SCCS075 – OCTOBER 2001
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Function and Pinout Compatible With the
Fastest Bipolar Logic
25-Ω Output Series Resistors Reduce
Transmission-Line Reflection Noise
Reduced V
OH
(Typically = 3.3 V) Version 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
3-State Outputs
ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)
Fully Compatible With TTL Input and
Output Logic Levels
12-mA Output Sink Current
15-mA Output Source Current
description
The CY74FCT2573T is an 8-bit, high-speed CMOS, TTL-compatible buffered latch with 3-state outputs that is
ideal for driving high-capacitance loads, such as memory and address buffers. On-chip 25-Ω termination
resistors at the outputs reduce system noise caused by reflections. The CY74FCT2573T can replace the
CY74FCT573T to reduce noise in an existing design.
When the latch-enable (LE) input is high, the flip-flops appear transparent to the data. Data that meets the
required setup times are latched when LE transitions from high to low. Data appears on the bus when the
output-enable (OE
) input is low. When OE is high, the bus output is in the high-impedance state. In this mode,
data can be entered into the latches.
This device is 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.
ORDERING INFORMATION
T
A
PACKAGE
†
SPEED
(ns)
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
QSOP – Q Tape and reel 4.7 CY74FCT2573CTQCT FCT2573C
SOIC SO
Tube 4.7 CY74FCT2573CTSOC
FCT2573C
40°Cto85°C
SOIC
–
SO
Tape and reel 4.7 CY74FCT2573CTSOCT
FCT2573C
–
40°C
to
85°C
QSOP – Q Tape and reel 5.2 CY74FCT2573ATQCT FCT2573A
SOIC SO
Tube 8 CY74FCT2573TSOC
FCT2573
SOIC
–
SO
Tape and reel 8 CY74FCT2573TSOCT
FCT2573
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
Copyright  2001, 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.
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.
OE
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
GND
Q OR SO PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
LE