MM74C945N ,4 Digit Up/Down Counter/Decoder/DriverGeneral Description
The MM74C945 and MM74C947 are synchronous
4 digit up/down counters with lat ..
MM74C947CQH ,4 Digit Up/Down Counter/Decoder/DriverFeatures
. 4 Decade Synchronous Up/Down Counter
. All Circuitry for Segments and Backplane of
..
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MM74C945N-MM74C947CQH
4 Digit Up/Down Counter/Decoder/Driver
19-0935 Rev J, 1/93
displays.
2AMLillDi)Cll2fly'll
4 Digit Up/Down 'tounterfDeetoderfDriger
General Description
The MM74C945 and MM740947 are synchronous
4 digit up/down counters with latches, T-segment
decoders, and all segment and backplane driver, and
oscillator circuitry necessary to directly drive LCD
Maxim's MM74C945 has a select input which allows the
counter contents or the latch contents to be displayed,
and a blanking input which allows the display to be
blanked.
The MM74C947 only displays the latch contents, but
provides leading zero blanking. The leading zero
blanking input allowsthe userto force leading zeros to
be displayed, and the leading zero output allows cas-
caded counters to blank leading zeroes properly.
Both devices provide 28 segment outputs and a back-
plane input/output. When the oscillator pin is open, the
device generates its own display waveform timing.
When the oscillator pin is grounded, the backplane pin
becomes an input.
The MM74C945 and MM74C947 are available in a 44
Fea tures
4 Decade Synchronous Up/Down Counter
All Clrcultry tor Segments and Backplane of
4-Dlglt LCD
Carry/Borrow Output Allows Ripple or
Synchronous Cascading
Schmltt Trigger Count Input
Store and Reset Inputs Allow Operation as
Frequency or Period Counter
MM74C945 Provides Input to Select Display of
Counter or Latch
MM74C947 Provides Leadlng Zero Blanking Input
and Output. Least Slgnmcant Dlglt May be Blanked.
lead plastic chip carrier package in addition to the
standard 40 lead plastic DIP.
A ppllcations
Hour Meter
Totalizer
Unit Counter
Frequency Counter
Tachometer
-__. Typical Operating Circuit
1 hx W -
m J-'-------,
- Ct Ct f M
a cr u I. ma:
UT msmv Inns“ mo.
_ . mm
i%iit 1L».
Mnxm" 5mm PAUSE"
o----'-
MM74 C94 7 1
ENABLE -v-4h-
count ENABLED
LN mmsn
l L28 IN
l l LIB ENABLE
COUNT MW)!
L--, 2-26 UP/DOWI =-o-
CDUNT UP
Unit Counter
Ordering Information
PART TEMP, RANGE PACKAGE
MM74C945N -40''C to r85''C 40 Lead Plastic DIP
MM74C945CQH 0°C to 40°C 44 Lead Plastic Chip Carrier
MM74C945C/D 0°C to s70''C Dice
MM74C947N -40''C to +85°C 40 Lead Plastic DIP
MM74C947COH 0°C to 070°C 44 Lead Plastic ic-tTin-sa-fir)
MM74C947C/D 0°C to ~70°c Dice
Pin Configuration
Top View
ha: I n 3TL'. ill
El 2 Ig]' CI
tll 38 ill
Fl 4 E Al
ap II 161 OSCILLATOR
A '.Ti. 3. MO
il 1 3: STORE
C I RESET
il cc M’”‘""' CLOCK
E2 CE MM746945 1 ENABLE
62 U: MM74C947 LN DUT [BLANKINBI'
F [IE L28 m [SELECTI'
A3 CE E CARL
M E UP/DUWN
c3 15 lin F4
03 CE) E M
E3 'rr". .r1,' E4
il3 CE 21] M
F3 CE E M
M E To M
'Ntrte.
r 7% 71%“ T- "rac7, ,
_'' -FuIEPP, - _ FUNCTIO.N
_29 l - _S:ecl LZB ,
. #234 W - To; :.
See Last Page for 44 Lead Chip Carrier Pin Configuration,
lVl/l Xl/VI
Maxim Integrated Products 1
l #6/9fl763t'1WW
MM 74 694 5/94 7
4 Digit Up/Down Counter/Decoder/Driver
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ...........
............. 6.5V
input Voltage .......................
Power Dissipation
40 Lead Plastic Dip ................
44 Lead Plastic Chip Carrier .......
....... -0.3V to V’ +0.3V
................. 0.5W
.................. 0.5W
Operating Vcc Range ........................... 3.0V to 6.0V
Operating Temperature Range - ............. -40°C to +85''C
Storage Temperature Range ................ -65''C to +160°C
Lead Temperature (Soldering, 10 sec.) ................ +300°C
Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the demon. These are stress ratings only and functional
operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not Implied. Exposure to
absolute maximum rating conditions for exlsnded periods may alien! device rerfiat0ty
ELECTRICAL CHARACTERISTICS
Min/max limits apply across temperature range , unless otherwise noted,
PARAMETER I CONDITIONS MIN 1 TYP MAX UNITS
CMOS TO CMOS
Vr, Positive Going Threshold - _
Voltage (Clock Only) Vcc - 5V, VIN (0 5) V 2 5 2.9 3.25 V
Vr, Negative Going Threshold = a
Voltage (Clock Only) Vcc 5V, V'" (5 O) V 1,5 2.2 2.4 V
Hysteresis (V7. - VT_) -
(Clock Only) Vcc - 5V 0.1 (17 1.75 V
Logical "I" Input Voltage (VIN o) Vcc = 5V 3.5 V
Logical "ty' Input Voltage (VIN o) Vcc = 5V 1.5 V
Logical "1" Output Voltage - - _
(Vow (1,)(LZO and Carry) Vcc - 5V, lo - 10 “A 4.5 V
Logical "O" Output Voltage - -
(V0UT o)(LZ0 and Carry) Vcc - w, lo - +10 “A 0.5 V
Clock Input Current l I ml Vcc = 5V, VIN = 5V/0V 0.005 1.0 “A
Input Current © Pins 27, 29,31,33, Vcc = 5V, VIN = OV 11.O ps/N
and 34 (Note 1) VIN = SV tro ps/t
Oscillator Input Current (IOSL) Vcc = 5V, V.N = 0V/5V t5 115.0 HA
Supply Current (Icc)(Note 2) Vcc = 5V, VIN = 0V/5V 10 60 "
Oscillator Input Voltage When Driving Oscillator
G, (OSC) Pin with External Signal Vcc -0.2 V
VIL (030) 0.2 Vcc V
DC Offset Voltage (Note 3) Vcc = SV 25 mV
CMOS/LPTTL INTERFACE
Logical "1" Input Voltage (VIN op Vcc = 4.75V Vcc-1.5V V
Logical "O" Input Voltage (VIN o) Vcc = 4.75V 0.8 V
Logical "l" Output Voltage = = -
(VouT (1,)(LZO and Carry) Vcc 4.75V, lo 360 MA 2,4 V
I Logical "O" Output Voltage = = t
(Vow (0,)(LZO and Carry) Vcc 4.75v, lo 360 “A 0.4 v
OUTPUT DRIVE (SHORT CIRCUIT CURRENT)
Output Source Current Vcc = 5V, Vow = 0V
(lsouRce)(LZ0 and Carry) TA = 25''C "75 2.7 mA
Output Sink Current Vcc = 5V, Vour = 5V
(Ismmzo and Carry) TA = 25°C "75 3.2 mA
Output Source Current Vcc = 5V, Vow = 0V 1.4 20 mA
(lsouRcE)(Segment Outputs) TA = 25°C
Output Sink Current Vcc = 5V, Voum = 5V
(lsNs)(Segment Output) TA = 25°C 1,4 22 mA
Output Source Current Vcc 2 5V, VOUT = 0V _
(lsoumsE)(Backplane Output) T, = 25°C 12% 15.0 mA
Output Sink Current Vcc = 5V, Vour = 5V
(lwo0(Backplane Output) TA = 25° C 12.6 20,0 mA
Nate 1: Does not apply to backplane and oscillator pins. Does apply to pin 30 on MM740945.
Note 2: Display blanked. See Test Circuit.
Note 3: DC offset voltage is the effective DC voltage the LCD will have between any segment and the backplane.
lVl/J X I IVI
