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PDF MM74C912N Data sheet ( Hoja de datos )
| Número de pieza | MM74C912N | |
| Descripción | 6-Digit BCD Display Controller/Driver | |
| Fabricantes | Fairchild | |
| Logotipo |  |
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October 1987
Revised January 1999
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
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 VCC
supply.
Features
s Direct segment drive (100 mA typ.) 3-STATE
s 6 registers addressed like RAM
s Internal oscillator and scanning circuit
s Direct base drive to digit transistor (20 mA typ.)
s Internal segment decoder
s TTL compatible inputs
Ordering Code:
Order Number Package Number
Package Description
MM74C912N
N28B
28-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-010, 0.600” Wide
Connection Diagram
Dual-In-Line Package
Top View
© 1999 Fairchild Semiconductor Corporation DS005916.prf
www.fairchildsemi.com
1 page  
AC Electrical Characteristics (Note 5)
VCC = 5V, tr = tf = 20 ns, CL = 50 pF
Symbol
Parameter
Conditions
tCW
tAW
tWW
tDW
tWD
tWA
tWC
t1H, t0H
tH1, tH0
tIB
fMUX
Chip Enable to Write
Enable Setup Time
Address to Write
Enable Setup Time
Write Enable Width
Data to Write Enable
Setup Time
Write Enable to Data
Hold Time
Write Enable to Address
Hold Time
Write Enable to Chip Enable
Hold Time
Logical “1”, Logical “0”
Levels into 3-STATE
3-STATE to Logical “1” to
Logical “0” Level
Interdigit Blanking Time
Multiplex Scan Frequency
TJ = 25°C
TJ = 125°C
TJ = 25°C
TJ = 125°C
TJ = 25°C
TJ = 125°C
TJ = 25°C
TJ = 125°C
TJ = 25°C
TJ = 125°C
TJ = 25°C
TJ = 125°C
TJ = 25°C
TJ = 125°C
RL = 10k, TJ = 25°C
CL = 10 pF, TJ = 125°C
RL = 10k, TJ = 25°C
CL = 50 pF, TJ = 125°C
TJ = 25°C
TJ = 125°C
TJ = 25°C
TJ = 125°C
CIN Input Capacitance
(Note 6)
COUT
3-STATE Output Capacitance
(Note 6)
Note 5: AC Parameters are guaranteed by DC correlated testing.
Note 6: Capacitance is guaranteed by periodic testing.
Min
Typ
Max
Units
35 15
50 20
35 15
50 20
400 225
450 250
390 225
430 250
0 −10
0 −15
0 −10
0 −15
50 30
75 40
275 500
325 600
325 600
375 700
5 10
10 20
350
250
5 7.5
30 50
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
µs
µs
Hz
Hz
pF
pF
5 www.fairchildsemi.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MM74C912N.PDF ] | |
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