mm74c911 Fairchild Semiconductor, mm74c911 Datasheet

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mm74c911

Manufacturer Part Number
mm74c911
Description
4-digit Expandable Segment Display Controller
Manufacturer
Fairchild Semiconductor
Datasheet

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© 1999 Fairchild Semiconductor Corporation
MM74C991N
MM74C911
4-Digit Expandable Segment Display Controller
General Description
The MM74C911 display controller is an interface element
with memory that drives a 4-digit, 8-segment LED display.
The MM74C911 allows individual control of any segment in
the 4-digit display. The number of segments per digit can
be expanded without any external components. For exam-
ple, two MM74C911’s can be cascaded to drive a 16-seg-
ment alpha-numeric display.
The display controllers receive data information through 8
data lines a, b…DP, and digit information through 2
address inputs K1 and K2. 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 high drive (100 mA typ.) 3-STATE output
drivers which directly drive the LED display. 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,
or for disabling the output drive for power conservation.
Ordering Code:
Connection Diagram
Order Number
Package Number
N28B
28-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS 010, 0.600” Wide
DS005915.prf
Pin Assignments for DIP
Top View
The digit outputs directly drive the base of the digit transis-
tor when the control pin labeled DIGIT INPUT OUTPUT,
DIO, is LOW. When DIO is HIGH, the digit lines turn into
inputs and the internal scanning multiplexer is disabled.
When any digit line is forced HIGH by an external device,
usually another MM74C911, the data information for that
digit is presented to the output. In this manner, 16-segment
alpha-numeric displays, 24- or 32-segment displays, or an
array of discrete LED's can be controlled by the simple cas-
cading of expandable segment display controllers. All
inputs except digit inputs are TTL compatible and do not
clamp input voltages above V
Features
Direct segment drive (100 mA typ.) 3-STATE
4 registers addressed like RAM
Internal oscillator and scanning circuit
Direct base drive to digit transistor
Segment expandability without external components
TTL compatible inputs
Power saver mode—5 W (typ.)
Package Description
CC
October 1987
Revised January 1999
.
www.fairchildsemi.com

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mm74c911 Summary of contents

Page 1

... The MM74C911 allows individual control of any segment in the 4-digit display. The number of segments per digit can be expanded without any external components. For exam- ple, two MM74C911’s can be cascaded to drive a 16-seg- ment alpha-numeric display. The display controllers receive data information through 8 data lines a, b… ...

Page 2

... Since every seg- ment is under microprocessor control, great versatility is obtained. Low power standby operation occurs with both SOE and DIO inputs HIGH. This condition forces the MM74C911 to a quiescent state typically drawing less than supply current with a standby supply voltage as low as 3V. 2 ...

Page 3

Absolute Maximum Ratings (Note 2) Voltage at Any Pin except Inputs 0. Voltage at Any Input except Digits Operating Temperature Range Storage Temperature Range Power Dissipation (P ) Refer D(MAX) DC Electrical ...

Page 4

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

Page 5

Switching Time Waveforms Multiplexing Output Waveforms Typical Performance Characteristics Segment outputs if shorted to ground will exceed maximum power dissipation of the device. Applications Segment Output Structure (Continued) Read Data Waveforms Note A: All other digit lines are at a ...

Page 6

Input Protection Segment Expansion Typical Application 6 ...

Page 7

Alpha-Numeric Display Segment Identification 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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