• Significant Power Reduction Compared to LSTTL
Logic ICs
• HC Types
- 2V to 6V Operation
- High Noise Immunity: N
= 30%, NIH = 30% of V
IL
at VCC = 5V
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
V
= 0.8V (Max), VIH = 2V (Min)
IL
- CMOS Input Compatibility, I
≤ 1µA at VOL, V
l
o
C to 125oC
CC
OH
CD74HCT390
High Speed CMOS Logic
Dual Decade Ripple Counter
Description
The Harris CD74HC390 and CD574HCT390 dual 4-bit
decade ripple counters are high-speed silicon-gate CMOS
devices and are pin compatible with low-power Schottky TTL
(LSTTL). These devices are divided into four separately
clocked sections. The counters have two divide-by-2 sections and two divide-by-5 sections. These sections are normally used in a BCD decade or bi-quinary configuration,
since they share a common master reset (nMR). If the two
master reset inputs (1MR and 2MR) are used to simultaneously clear all 8 bits of the counter, a number of counting
configurations are possible within one package. The separate clock inputs (n
ple counter or frequency division applications of divide-by-2,
4. 5, 10, 20, 25, 50 or 100. Each section is triggered by the
High-to-Low transition of the input pulses (n
For BCD decade operation, the nQ0 output is connected to
the n
CP1 input of the divide-by-5 section. For bi-quinary
decade operation, the nO3 output is connected to the n
input and nQ
The master reset inputs (1MR and 2MR) are active-High
asynchronous inputs to each decade counter which operates on the portion of the counter identified by the “1” and “2”
prefixes in the pin configuration. A High level on the nMR
input overrides the clock and sets the four outputs Low.
Ordering Information
CP0 and nCP1) of each section allow rip-
CP0 and nCP1).
becomes the decade output.
0
CP0
Pinout
CD74HC390, CD74HCT390
TOP VIEW
16
1
1CP0
1MR
2
1Q
3
0
4
1CP1
1Q
5
1
6
1Q
2
1Q
7
3
8
GND
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
CD74HC390E-55 to 12516 Ld PDIPE16.3
CD74HCT390E-55 to 12516 Ld PDIPE16.3
CD74HC390M-55 to 12516 Ld SOICM16.15
CD74HCT390M-55 to 12516 Ld SOICM16.15
NOTES:
1. When ordering, use the entire partnumber. Add the suffix 96 to
obtain the variant in the tape and reel.
2. Wafer for this part number is available which meets all electrical
specifications. Please contact your local sales office or Harris
customer service for ordering information.
1
PKG.
NO.
File Number 1838.2
Functional Diagram
CD74HC390, CD74HCT390
1 (15)
nCP0
2 (14)
nMR
4 (12)
nCP1
GND = 8
V
= 16
CC
TRUTH TABLE
INPUTS
↑LNo Change
↓LCount
XHAll Qs Low
NOTE: H = High Voltage Level, L = Low Voltage Level, X = Don’t Care,
↑ = Transition from Low to High Level, ↓ = Transition from High to Low.
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
3. θJA is measured with the component mounted on an evaluation PC board in free air.
FIGURE 1. HC AND HCU TRANSITION TIMES AND PROPAGA-
TION DELAY TIMES, COMBINATION LOGIC
= 6ns
t
PLH
t
f
1.3V
10%
90%
t
3V
GND
TLH
tr = 6ns
INPUT
t
INVERTING
OUTPUT
THL
t
PHL
2.7V
1.3V
0.3V
FIGURE 2. HCT TRANSITION TIMES AND PROPAGATION
DELAY TIMES, COMBINATION LOGIC
7
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accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
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Copyright 1999, Texas Instruments Incorporated
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