mm74c912 Fairchild Semiconductor, mm74c912 Datasheet

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mm74c912

Manufacturer Part Number
mm74c912
Description
6-digit Bcd Display Controller/driver
Manufacturer
Fairchild Semiconductor
Datasheet

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© 1999 Fairchild Semiconductor Corporation
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
CC

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mm74c912 Summary of contents

Page 1

... 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 ...

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 segment outputs drive the LED display directly through current limiting resistors. ...

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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