mm74c927 Fairchild Semiconductor, mm74c927 Datasheet

mm74c927

Manufacturer Part Number

mm74c927

Description

4-digit Counters With Multiplexed

Manufacturer

Fairchild Semiconductor

Datasheet

1.MM74C927.pdf (9 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

H&T Electronics

Part Number:

mm74c927N

Quantity:

Current page: 1 of 9
Download datasheet (116Kb)

MM74C925N

MM74C926N

MM74C927N

MM74C928N

MM74C925 • MM74C926 • MM74C927 • MM74C928

4-Digit Counters with Multiplexed

7-Segment Output Drivers

General Description

The MM74C925, MM74C926, MM74C927 and MM74C928

CMOS counters consist of a 4-digit counter, an internal out-

put latch, NPN output sourcing drivers for a 7-segment dis-

play, and an internal multiplexing circuitry with four

multiplexing outputs. The multiplexing circuit has its own

free-running oscillator, and requires no external clock. The

counters advance on negative edge of clock. A HIGH sig-

nal on the Reset input will reset the counter to zero, and

reset the carry-out LOW. A LOW signal on the Latch

Enable input will latch the number in the counters into the

internal output latches. A HIGH signal on Display Select

input will select the number in the counter to be displayed;

a LOW level signal on the Display Select will select the

number in the output latch to be displayed.

The MM74C925 is a 4-decade counter and has Latch

Enable, Clock and Reset inputs.

The MM74C926 is like the MM74C925 except that it has a

display select and a carry-out used for cascading counters.

The carry-out signal goes HIGH at 6000, goes back LOW

at 0000.

The MM74C927 is like the MM74C926 except the second

most significant digit divides by 6 rather than 10. Thus, if

the clock input frequency is 10 Hz, the display would read

tenths of seconds and minutes (i.e., 9:59.9).

The MM74C928 is like the MM74C926 except the most sig-

nificant digit divides by 2 rather than 10 and the carry-out is

an overflow indicator which is HIGH at 2000, and it goes

Ordering Code:

Order Number

Package Number

N16E

N18A

16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide

18-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide

DS005919.prf

back LOW only when the counter is reset. Thus, this is a

3½-digit counter.

Features

Design Considerations

Segment resistors are desirable to minimize power dissipa-

tion and chip heating. The DS75492 serves as a good digit

driver when it is desired to drive bright displays. When

using this driver with a 5V supply at room temperature, the

display can be driven without segment resistors to full illu-

mination. The user must use caution in this mode however,

to prevent overheating of the device by using too high a

supply voltage or by operating at high ambient tempera-

tures.

The input protection circuitry consists of a series resistor,

and a diode to ground. Thus input signals exceeding V

will not be clamped. This input signal should not be allowed

to exceed 15V.

Wide supply voltage range:

Guaranteed noise margin: 1V

High noise immunity: 0.45 V

High segment sourcing current: 40 mA

@ V

Internal multiplexing circuitry

Package Description

1.6V, V

October 1987

Revised January 1999

3V to 6V

(typ.)

www.fairchildsemi.com

Related parts for mm74c927

mm74c927 Summary of contents

Page 1

... The carry-out signal goes HIGH at 6000, goes back LOW at 0000. The MM74C927 is like the MM74C926 except the second most significant digit divides by 6 rather than 10. Thus, if the clock input frequency is 10 Hz, the display would read tenths of seconds and minutes (i ...

Page 2

... Low, latch condition Clock —Negative edge sensitive Logic Diagrams www.fairchildsemi.com Pin Assignments for DIP Top View MM74C926, MM74C927, MM74C928 Segment Output — Current sourcing with 1.6V (typ.) Also, sink capability CC LTTL loads Digit Output — Current sourcing with 1.75V. Also, sink capability Carry-Out — ...

Page 3

... Logic Diagrams (Continued) MM74C926 MM74C927 MM74C928 3 www.fairchildsemi.com ...

Page 4

... 150 4.75V, V 1.75V, T 150 OUT j V 5V 1.75 CC OUT 1.75 CC OUT CC j MM74C925: (Note 2) MM74C926, MM74C927, MM74C928 6.5V 260 C Typ Max Units V 1 0.5 V 0.005 1 A 0.005 A 20 1000 ...

Page 5

AC Electrical Characteristics pF, unless otherwise noted A L Symbol Parameter f Maximum Clock Frequency MAX Maximum Clock Rise or Fall Time Reset Pulse Width WR t Latch Enable ...

Page 6

Typical Performance Characteristics Segment Output Driver www.fairchildsemi.com (Continued) Input Protection Common Cathode LED Display Segment Identification 6 ...

Page 7

Switching Time Waveforms Input Waveforms Multiplexing Output Waveforms T 1/f MUX Carry-Out Waveforms 7 www.fairchildsemi.com ...

Page 8

Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide www.fairchildsemi.com Package Number N16E 8 ...

Page 9

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 18-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN ...

Related keywords

mm74c927 datasheet
mm74c927 data sheet
mm74c927 pdf datasheet
mm74c927 component
mm74c927 part
mm74c927 distributor
mm74c927 RoHS
mm74c927 datasheet download