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Datasheet UPD4991A Equivalent ( PDF ) |
| N.º | Número de pieza | Descripción | Fabricantes | |
| 3 | UPD4991A | 4-BIT PARALLEL I/O CALENDAR CLOCK DATA SHEET
MOS INTEGRATED CIRCUIT
µPD4991A
4-BIT PARALLEL I/O CALENDAR CLOCK
The µPD4991A is a CMOS integrated circuit that has the ability to input/output 4-bit parallel time data and calendar data to/from a microcomputer and includes an alarm function. Its reference oscillation frequency is 3 |
 NEC |
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| 2 | UPD4991ACX | 4-BIT PARALLEL I/O CALENDAR CLOCK DATA SHEET
MOS INTEGRATED CIRCUIT
µPD4991A
4-BIT PARALLEL I/O CALENDAR CLOCK
The µPD4991A is a CMOS integrated circuit that has the ability to input/output 4-bit parallel time data and calendar data to/from a microcomputer and includes an alarm function. Its reference oscillation frequency is 3 |
NEC |
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| 1 | UPD4991AGS | 4-BIT PARALLEL I/O CALENDAR CLOCK DATA SHEET
MOS INTEGRATED CIRCUIT
µPD4991A
4-BIT PARALLEL I/O CALENDAR CLOCK
The µPD4991A is a CMOS integrated circuit that has the ability to input/output 4-bit parallel time data and calendar data to/from a microcomputer and includes an alarm function. Its reference oscillation frequency is 3 |
NEC |
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