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MM74C925NNSCN/a200avai4-Digit Counters with Multiplexed 7-Segment Output Drivers
MM74C926NWINGSHINGN/a2avai4-Digit Counters with Multiplexed 7-Segment Output Drivers


MM74C925N ,4-Digit Counters with Multiplexed 7-Segment Output DriversMM74C925 • MM74C926 4-Digit Counters with Multiplexed 7-Segment Output DriversOctober 1987Revised J ..
MM74C926N ,4-Digit Counters with Multiplexed 7-Segment Output DriversFunctional DescriptionReset — Asynchronous, active high Segment Output — Current sourcing with 40 ..
MM74C928N ,4-Digit Counters with MultiplexedFeaturesput latch, NPN output sourcing drivers for a 7-segment dis-play, and an internal multiplexi ..
MM74C93N ,4-Bit Binary CounterElectrical Characteristics” providesconditions for actual device operation.(Soldering, 10 seconds) ..
MM74C93N ,4-Bit Binary CounterFeaturesThe MM74C93 binary counter and complementary MOS

MM74C925N-MM74C926N
4-Digit Counters with Multiplexed 7-Segment Output Drivers
MM74C925 • MM74C926 4-Digit Counters with Multiplexed 7-Segment Output Drivers October 1987 Revised January 2004 MM74C925  MM74C926 4-Digit Counters with Multiplexed 7-Segment Output Drivers General Description Features The MM74C925 and MM74C926 CMOS counters consistWide supply voltage range: 3V to 6V of a 4-digit counter, an internal output latch, NPN outputGuaranteed noise margin: 1V sourcing drivers for a 7-segment display, and an internal High noise immunity: 0.45 V (typ.) CC multiplexing circuitry with four multiplexing outputs. The High segment sourcing current: 40 mA multiplexing circuit has its own free-running oscillator, and requires no external clock. The counters advance on nega- @ V − 1.6V, V = 5V CC CC tive edge of clock. A HIGH signal on the Reset input will Internal multiplexing circuitry reset the counter to zero, and reset the carry-out LOW. A LOW signal on the Latch Enable input will latch the number Design Considerations in the counters into the internal output latches. A HIGH sig- nal on Display Select input will select the number in the Segment resistors are desirable to minimize power dissipa- counter to be displayed; a LOW level signal on the Display tion and chip heating. The DS75492 serves as a good digit Select will select the number in the output latch to be dis- driver when it is desired to drive bright displays. When played. using this driver with a 5V supply at room temperature, the display can be driven without segment resistors to full illu- The MM74C925 is a 4-decade counter and has Latch mination. The user must use caution in this mode however, Enable, Clock and Reset inputs. to prevent overheating of the device by using too high a The MM74C926 is like the MM74C925 except that it has a supply voltage or by operating at high ambient tempera- display select and a carry-out used for cascading counters. tures. The carry-out signal goes HIGH at 6000, goes back LOW The input protection circuitry consists of a series resistor, at 0000. and a diode to ground. Thus input signals exceeding V CC will not be clamped. This input signal should not be allowed to exceed 15V. Ordering Code: Order Number Package Number Package Description MM74C925N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide MM74C926N N18B 18-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Connection Diagrams Pin Assignments for DIP Top View Top View MM74C925 MM74C926 © 2004 DS005919
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