SCAS004 − D2957, JULY 1987 − REVISED APRIL 1993
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77001
Copyright 1993, Texas Instruments Incorporated
2−1
• 8-Latches in a Single Package
• 3-State Bus-Driving Inverting Outputs
• Full Parallel Access for Loading
• Buffered Control Inputs
• Flow-Through Architecture Optimizes
PCB Layout
• Center-Pin V
CC
and GND Configurations
Minimize High-Speed Switching Noise
• EPICt (Enhanced-Performance Implanted
CMOS) 1-mm Process
• 500-mA Typical Latch-Up Immunity at 125°C
• Package Options Include Plastic
Small-Outline Packages, Ceramic Chip
Carriers, and Standard Plastic and Ceramic
300-mil DIPs
description
These 8-bit latches feature 3-state outputs
designed specifically for driving highly capacitive
or relatively low-impedance loads. They are
particularly suitable for implementing buffer
registers, I/O ports, bidirectional bus drivers, and
working registers.
The eight latches of the ′AC11533 are transparent
D-type latches. While the enable (C) is high, the
Q
outputs will follow the complements of the (D)
inputs. When the output control OC
is taken low,
the Q
outputs will be latched. The ′AC11533 is
functionally equivalent to the ′AC11373 except for
having inverted outputs.
A buffered output-control (OC) input can be used
to place the eight outputs in either a normal logic
state (high or low logic levels) or a high-
impedance state. In the high-impedance state,
the outputs neither load nor drive the bus lines significantly. The high-impedance third state and increased drive
provide the capability to drive the bus lines in a bus-organized system without need for interface or pull-up
components.
The output control (OC
) does not affect the internal operations of the latches. Old data can be retained or new
data can be entered while the outputs are off.
The 54AC11533 is characterized for operation over the full military temperature range of −55°C to 125°C. The
74AC11533 is characterized for operation from − 40°C to 85°C.
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
1Q
2Q
3Q
4Q
GND
GND
GND
GND
5Q
6Q
7Q
8Q
OC
1D
2D
3D
4D
V
CC
V
CC
5D
6D
7D
8D
C
54AC11533 . . . JT PACKAGE
74AC11533 . . . DW OR NT PACKAGE
(TOP VIEW)
321
13 14
5
6
7
8
9
10
11
7D
8D
C
NC
8Q
7Q
6Q
2D
1D
OC
NC
1Q
2Q
3Q
4
15 16 17 18
GND
GND
NC
GND
GND
5Q
3D
4D
NC
54AC11533 . . . FK PACKAGE
(TOP VIEW)
28 27 26
25
24
23
22
21
20
19
12
4Q
5D
6D
CC
V
CC
V
NC − No internal connection
!" # $%&" !# '%()$!" *!"&+
*%$"# $ " #'&$$!"# '& ",& "&# &-!# #"%&"#
#"!*!* .!!"/+ *%$" '$&##0 *&# " &$&##!)/ $)%*&
"&#"0 !)) '!!&"&#+
EPIC is a trademark of Texas Instruments Incorporated.
