MM74C912N Fairchild Semiconductor, MM74C912N Datasheet

MM74C912N

Manufacturer Part Number

MM74C912N

Description

IC CONTROLLER DISPLAY 28-DIP

Manufacturer

Fairchild Semiconductor

Datasheet

1.MM74C912N.pdf (8 pages)

Specifications of MM74C912N

Display Type

LED

Configuration

7 Segment + DP

Interface

BCD

Digits Or Characters

6 Digits

Current - Supply

500µA

Voltage - Supply

3 V ~ 6 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Through Hole

Package / Case

28-DIP (0.600", 15.24mm)

Number Of Digits

Number Of Segments

Maximum Operating Temperature

+ 85 C

Mounting Style

Through Hole

Minimum Operating Temperature

- 40 C

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Other names

74C912
74C912N

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MM74C912N

MM74C912

6-Digit BCD Display Controller/Driver

General Description

The MM74C912 display controllers are interface elements,

with memory, that drive a 6-digit, 8-segment LED display.

The display controllers receive data information through 5

data inputs A, B, C, D and DP, and digit information through

3 address inputs K1, K2 and K3.

The input data is written into the register selected by the

address information when CHIP ENABLE, (CE), and

WRITE ENABLE, (WE), are LOW and is latched when

either CE or WE return HIGH. Data hold time is not

required. A self-contained internal oscillator sequentially

presents the stored data to a decoder where 4 data bits

control the format of the displayed character and 1 bit con-

trols the decimal point. The internal oscillator is controlled

by a control input labeled OSCILLATOR ENABLE, (OSE),

which is tied LOW in normal operation. A high level at OSE

prevents automatic refresh of the display.

The 7-segment plus decimal point output information

directly drives an LED display through high drive (100 mA

Ordering Code:

Connection Diagram

Order Number

Package Number

N28B

28-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-010, 0.600” Wide

DS005916.prf

Dual-In-Line Package

Top View

typ.) output drivers. The drivers are active when the control

pin labeled SEGMENT OUTPUT ENABLE, (SOE), is LOW

and go into 3-STATE when SOE is HIGH. This feature

allows for duty cycle brightness control and for disabling

the output drivers for power conservation.

The MM74C912 segment decoder converts BCD data into

7-segment format.

All inputs are TTL compatible and do not clamp to the V

supply.

Features

Direct segment drive (100 mA typ.) 3-STATE

6 registers addressed like RAM

Internal oscillator and scanning circuit

Direct base drive to digit transistor (20 mA typ.)

Internal segment decoder

TTL compatible inputs

Package Description

October 1987

Revised January 1999

www.fairchildsemi.com

Related parts for MM74C912N

MM74C912N Summary of contents

Page 1

... The 7-segment plus decimal point output information directly drives an LED display through high drive (100 mA Ordering Code: Order Number Package Number MM74C912N N28B 28-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-010, 0.600” Wide Connection Diagram © 1999 Fairchild Semiconductor Corporation typ.) output drivers. The drivers are active when the control pin labeled SEGMENT OUTPUT ENABLE, (SOE), is LOW and go into 3-STATE when SOE is HIGH ...

Page 2

Truth Tables CE Digit Address ...

Page 3

Functional Description The MM74C912 display controller is manufactured using metal gate CMOS technology. A single 5V 74 series TTL supply can be used for power and should be bypassed at the V pin. CC All inputs are TTL compatible; the ...

Page 4

Absolute Maximum Ratings (Note 3) Voltage at Any Pin Except Inputs 0. Voltage at Any Input Operating Temperature Range ( Storage Temperature Range ( Power Dissipation (P ) Refer MAX ...

Page 5

AC Electrical Characteristics Symbol Parameter t Chip Enable to Write CW Enable Setup Time t Address to Write AW Enable Setup Time t Write Enable Width WW ...

Page 6

Switching Time Waveforms T 1/f MUX Typical Performance Characteristics OUT Segment outputs if shorted to ground will exceed maximum power dissipation of the device OUT www.fairchildsemi.com Multiplexing Output Waveforms I AVG V ...

Page 7

Typical Applications Digit Output Structure Segment Output Structure Input Protection 7 www.fairchildsemi.com ...

Page 8

Physical Dimensions inches (millimeters) unless otherwise noted 28-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-010, 0.600” 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 APPROVAL ...

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