CD74HC194,
CD74HCT194
Data sheet acquired from Harris Semiconductor
SCHS164
High-Speed CMOS Logic
September 1997
4-Bit Bidirectional Universal Shift Register
Features
Description
• Four Operating Modes
The Harris CD74HC194 and CD74HCT194 are 4-bit shift
registers with Asynchronous Master Reset (MR). In the par-
allel mode (S0 and S1 are high), data is loaded into the
associated flip-flop and appears at the output after the posi-
tive transition of the clock input (CP). During parallel loading
serial data flow is inhibited. Shift left and shift right are
accomplished synchronously on the positive clock edge with
serial data entered at the shift left (DSL) serial input for the
shift right mode, and at the shift right (DSR) serial input for
- Shift Right, Shift Left, Hold and Reset
• Synchronous Parallel or Serial Operation
[ /Title
(CD74
HC194,
CD74H
CT194)
/Sub-
• Typical f
MAX
= 60MHz at V
= 5V, C = 15pF,
CC L
o
T = 25 C
A
• Asynchronous Master Reset
• Fanout (Over Temperature Range)
the shift left mode. Clearing the register is accomplished by
a Low applied to the Master Reset (MR) pin.
- Standard Outputs. . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
ject
(High-
Speed
CMOS
Logic
4-Bit
o
o
• Wide Operating Temperature Range . . . -55 C to 125 C
• Balanced Propagation Delay and Transition Times
Ordering Information
PKG.
o
PART NUMBER TEMP. RANGE ( C) PACKAGE
NO.
E16.3
E16.3
• Significant Power Reduction Compared to LSTTL
Logic ICs
CD74HC194E
CD74HCT194E
CD74HC194M
NOTES:
-55 to 125
-55 to 125
-55 to 125
16 Ld PDIP
16 Ld PDIP
• HC Types
- 2V to 6V Operation
16 Ld SOIC M16.15
- High Noise Immunity: N = 30%, N = 30% of V
IL IH CC
at V
= 5V
CC
• HCT Types
1. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.
- 4.5V to 5.5V Operation
2. Die for this part number is available which meets all electrical
specifications. Please contact your local sales office or Harris
customer service for ordering information.
- Direct LSTTL Input Logic Compatibility,
V = 0.8V (Max), V = 2V (Min)
IL IH
- CMOS Input Compatibility, I ≤ 1µA at V , V
OL OH
l
Pinout
CD74HC194, CD74HCT194
(PDIP, SOIC)
TOP VIEW
MR
1
2
3
4
5
6
7
8
16 V
CC
DSR
15 Q
14 Q
13 Q
12 Q
0
1
2
3
D
D
D
D
0
1
2
3
11 CP
10 S1
DSL
9
S0
GND
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
File Number 1668.1
Copyright © Harris Corporation 1997
1