MM74C90 Binary Counter Datasheet 

Part Number  MM74C90 
Description  4Bit Decade Counter 4Bit Binary Counter 
Manufacture  Fairchild 
Total Page  7 Pages 
Datasheet 
October 1987
Revised January 1999
MM74C90 • MM74C93
4Bit Decade Counter • 4Bit Binary Counter
General Description
The MM74C90 decade counter and the MM74C93 binary
counter and complementary MOS (CMOS) integrated cir
cuits constructed with N and Pchannel enhancement
mode transistors. The 4bit decade counter can reset to
zero or preset to nine by applying appropriate logic level on
the R01, R02, R91 and R92 inputs. Also, a separate flipflop
on the Abit enables the user to operate it as a divideby2,
5 or 10 frequency counter. The 4bit binary counter can be
reset to zero by applying high logic level on inputs R01 and
R02, and a separate flipflop on the Abit enables the user
to operate it as a divideby2, 8, or 16 divider. Counting
occurs on the negative going edge of the input pulse.
All inputs are protected against static discharge damage.
Features
s Wide supply voltage range: 3V to 15V
s Guaranteed noise margin: 1V
s High noise immunity: 0.45 VCC (typ.)
s Low power compatibility:
Fan out of 2 TTL driving 74L
s The MM74C93 follows the MM74L93 Pinout
Ordering Code:
Order Number
MM74C90N
MM74C93N
Package Number
N14A
N14A
Package Description
14Lead Plastic DualInLine Package (PDIP), JEDEC MS001, 0.300” Wide
14Lead Plastic DualInLine Package (PDIP), JEDEC MS001, 0.300” Wide
Connection Diagrams
MM74C90
Pin Assignments for DIP
MM74C93
Top View
Top View
© 1999 Fairchild Semiconductor Corporation DS005889.prf
www.fairchildsemi.com

Logic Diagrams
MM74C90
MM74C93
Truth Tables
MM74C90 4Bit Decade Counter BCD Count Sequence
Count
Output
QD QC QB QA
0 LLLL
1 LL LH
2 LLHL
3 L LHH
4 LHLL
5 LHLH
6 LHHL
7 LHHH
8 HLLL
9 HL LH
Output QA is connected to Input B for BCD count.
H = HIGH Level
L = LOW Level
X = Irrelevant
MM74C93 4Bit Binary Counter Binary Count Sequence
Count
Output
QD QC QB QA
0 LLLL
1 L LLH
2 L LHL
3 L LHH
4 LHLL
5 LHLH
6 LHHL
7 LHHH
8 HLLL
9 HLLH
10 H L H L
11 H L H H
12 H H L L
13 H H L H
14 H H H L
15 H H H H
Output QA is connected to input B for binary count sequence.
H = HIGH Level
L = LOW Level
X = Irrelevant
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2

Features  MM74C90 • MM74C93 4Bit Decade Counter • 4Bit Binary Counter October 1987 Revised January 1999 MM74C90 • MM74 C93 4Bit Decade Counter • 4Bit Bina ry Counter General Description The MM74 C90 decade counter and the MM74C93 bina ry counter and complementary MOS (CMOS) integrated circuits constructed with N  and Pchannel enhancement mode transi stors. The 4bit decade counter can res et to zero or preset to nine by applyin g appropriate logic level on the R01, R 02, R91 and R92 inputs. Also, a separat e flipflop on the Abit enables the us er to operate it as a divideby2, 5 or 10 frequency counter. The 4bit binary counter can be reset to zero by applyi ng high logic level on inputs R01 and R 02, and a separate flipflop on the Ab it enables the user to operate it as a divideby2, 8, or 16 divider. Counti ng occurs on the negative going edge of the input pulse. All inputs are protec ted against static discharge damage. F eatures s Wide supply voltage range: s Guaranteed noise margin: s High . 
Keywords  MM74C90, datasheet, pdf, Fairchild, 4Bit, Decade, Counter, 4Bit, Binary, Counter, M74C90, 74C90, 4C90, MM74C9, MM74C, MM74, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute 

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