CD74HC93,
CD74HCT93
Data sheet acquired from Harris Semiconductor
SCHS138C
High-Speed CMOS Logic
4-Bit Binary Ripple Counter
August 1997 - Revised September 2003
Features
Description
• Can Be Configured to Divide By 2, 8, and 16
• Asynchronous Master Reset
The CD74HC93 and CD74HCT93 are high-speed silicon-gate
CMOS devices and are pin-compatible with low power
Schottky TTL (LSTTL). These 4-bit binary ripple counters
consist of four master-slave flip-flops internally connected to
provide a divide-by-two section and a divide- by-eight section.
Each section has a separate clock input (CP0 and CP1) to
initiate state changes of the counter on the HIGH to LOW
[ /Title
(CD74
HC93,
CD74
HCT93
)
• Fanout (Over Temperature Range)
- Standard Outputs. . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
o
o
• Wide Operating Temperature Range . . . -55 C to 125 C
• Balanced Propagation Delay and Transition Times
clock transition. State changes of the Q outputs do not occur
n
simultaneously because of internal ripple delays. Therefore,
decoded output signals are subject to decoding spikes and
should not be used for clocks or strobes.
/Sub-
ject
• Significant Power Reduction Compared to LSTTL
Logic ICs
A gated AND asynchronous master reset (MR1 and MR2 is
provided which overrides both clocks and resets (clears) all
flip-flops.
(High
Speed
CMOS
Logic
4-Bit
Binary
Ripple
Counte
r)
• HC Types
- 2V to 6V Operation
- High Noise Immunity: N = 30%, N = 30% of V
IL IH CC
at V
= 5V
Because the output from the divide by two section is not
internally connected to the succeeding stages, the device
may be operated in various counting modes.
CC
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
In a 4-bit ripple counter the output Q must be connected
0
externally to input CP1. The input count pulses are applied
to clock input CP0. Simultaneous frequency divisions of 2, 4,
V = 0.8V (Max), V = 2V (Min)
IL IH
- CMOS Input Compatibility, I ≤ 1µA at V , V
l
OL OH
8, and 16 are performed at the Q , Q , Q , and Q outputs
0
1
2
3
as shown in the function table. As a 3-bit ripple counter the
input count pulses are applied to input CP1.
Pinout
Simultaneous frequency divisions of 2, 4, and 8 are available
CD74HC93
(PDIP, SOIC)
CD74HCT93
(PDIP)
at the Q , Q , Q outputs. Independent use of the first flip-
1
2
3
flop is available if the reset function coincides with the reset
of the 3-bit ripple-through counter.
TOP VIEW
Ordering Information
CP1
MR1
MR2
NC
1
2
3
4
5
6
7
14 CPO
13 NC
TEMP. RANGE
o
PART NUMBER
CD74HC93E
( C)
PACKAGE
14 Ld PDIP
12
Q
0
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
11 Q
3
CD74HC93M
CD74HC93MT
CD74HC93M96
CD74HCT93E
14 Ld SOIC
14 Ld SOIC
14 Ld SOIC
14 Ld PDIP
V
10 GND
CC
NC
NC
9
8
Q
1
2
Q
NOTE: When ordering, use the entire part number. The suffix 96
denotes tape and reel. The suffix T denotes a small-quantity reel
of 250.
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright © 2003, Texas Instruments Incorporated
1