MM74C90 Fairchild, MM74C90 Datasheet

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MM74C90

Manufacturer Part Number
MM74C90
Description
4-Bit Decade Counter 4-Bit Binary Counter
Manufacturer
Fairchild
Datasheet

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© 1999 Fairchild Semiconductor Corporation
MM74C90 • MM74C93
4-Bit Decade Counter • 4-Bit Binary Counter
General Description
The MM74C90 decade counter and the MM74C93 binary
counter and complementary MOS (CMOS) integrated cir-
cuits constructed with N- and P-channel enhancement
mode transistors. The 4-bit decade counter can reset to
zero or preset to nine by applying appropriate logic level on
the R
on the A-bit enables the user to operate it as a divide-by-2,
5 or 10 frequency counter. The 4-bit binary counter can be
reset to zero by applying high logic level on inputs R
R
Ordering Code:
MM74C90N
MM74C93N
Connection Diagrams
Order Number
02
, and a separate flip-flop on the A-bit enables the user
01
, R
02
, R
91
and R
Package Number
MM74C90
92
Top View
N14A
N14A
inputs. Also, a separate flip-flop
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
DS005889.prf
Pin Assignments for DIP
01
and
to operate it as a divide-by-2, -8, or -16 divider. Counting
occurs on the negative going edge of the input pulse.
All inputs are protected against static discharge damage.
Features
Wide supply voltage range:
Guaranteed noise margin: 1V
High noise immunity: 0.45 V
Low power compatibility:
The MM74C93 follows the MM74L93 Pinout
Fan out of 2 TTL driving 74L
Package Description
MM74C93
Top View
October 1987
Revised January 1999
CC
3V to 15V
(typ.)
www.fairchildsemi.com

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MM74C90 Summary of contents

Page 1

... MM74C90 • MM74C93 4-Bit Decade Counter • 4-Bit Binary Counter General Description The MM74C90 decade counter and the MM74C93 binary counter and complementary MOS (CMOS) integrated cir- cuits constructed with N- and P-channel enhancement mode transistors. The 4-bit decade counter can reset to ...

Page 2

... Logic Diagrams MM74C90 Truth Tables MM74C90 4-Bit Decade Counter BCD Count Sequence Count Output Output Q is connected to Input B for BCD count. ...

Page 3

... Reset/Count Function Table Output Count L X Count X L Count L X Count Reset/Count Function Table Output Count L Count www.fairchildsemi.com ...

Page 4

... Logical “0” Input Voltage IN(0) MM74C90, MM74C93 V Logical “1” Output Voltage OUT(1) MM74C90, MM74C93 V Logical “0” Output Voltage OUT(0) MM74C90, MM74C93 OUTPUT DRIVE (See Family Characteristics Data Sheet) (Short Circuit Current) I Output Source Current SOURCE (P-Channel) I Output Source Current SOURCE (P-Channel) ...

Page 5

... (MM74C90) t Min Pulse Width (MM74C93) t Min Pulse Width (MM74C90) t Min Pulse Width (MM74C90 Maximum Clock Rise r f and Fall Time t Minimum Clock Pulse Width W f Maximum Clock Frequency MAX C Input Capacitance ...

Page 6

... AC Test Circuits MM74C90 Clock rise and fall time Switching Time Waveforms MM74C90 and MM74C93 are solid line waveforms. Dashed line waveforms are for MM74C90 only. www.fairchildsemi.com MM74C93 Clock rise and fall time ...

Page 7

... Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. Package Number N14A 2 ...

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