MM74C928N Fairchild Semiconductor, MM74C928N Datasheet

MM74C928N

Manufacturer Part Number

MM74C928N

Description

IC COUNTER 4DIG 7SEG DRVR 18-DIP

Manufacturer

Fairchild Semiconductor

Datasheet

1.MM74C928N.pdf (9 pages)

Specifications of MM74C928N

Display Type

LED

Configuration

7 Segment

Interface

BCD

Digits Or Characters

4 Digits

Current - Supply

20µA

Voltage - Supply

3 V ~ 6 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Through Hole

Package / Case

18-DIP (0.300", 7.62mm)

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Other names

74C928
74C928N

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Manufacturer

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Price

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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 MM74C928N

MM74C928N Summary of contents

Page 1

... Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide MM74C927N N18A 18-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide MM74C928N N18A 18-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide © 1999 Fairchild Semiconductor Corporation back LOW only when the counter is reset. Thus, this is a 3½ ...

Page 2

Connection Diagrams Top View MM74C925 Functional Description Reset — Asynchronous, active high Display Select — High, displays output of counter Low, displays output of latch Latch Enable — High, flow through condition Low, latch condition Clock —Negative edge sensitive Logic ...

Page 3

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

Page 4

Absolute Maximum Ratings Voltage at Any Output Pin GND 0. Voltage at Any Input Pin GND Operating Temperature Range ( Storage Temperature Range Power Dissipation (P ) Refer D(MAX) DC Electrical Characteristics Min/Max ...

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 ...

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