8155 2048-Bit Static MOS RAM with I/O Ports and Timer PDIP-40

Description

8155 2048-Bit Static MOS RAM with I/O Ports and Timer PDIP-40 The 8155 2048-Bit Static MOS RAM with I/O Ports and Timer PDIP-40 is a multifunction peripheral device combining 256×8bits of static RAM with three programmable I/O ports (two 8-bit ports and one 6-bit port) and a 14-bit programmable binary counter/timer, designed for direct interfacing to multiplexed microprocessor buses. The device operates from a single +5VDC supply, provides a multiplexed address/data bus for economical pin usage, and is offered in standard PDIP-40 packaging to facilitate prototyping and retrofit applications. Features 2048-bit static MOS RAM organized as 256×8 for program/work RAM and data buffering. Three programmable I/O ports (two 8-bit ports + one 6-bit port) for general-purpose digital interfacing. Integrated 14-bit programmable binary counter/timer with multiple operating modes for event timing and pulse generation. Multiplexed address/data bus with ALE support for simple microprocessor interfacing. Single +5VDC supply operation and TTL-compatible control signals for legacy 8-bit systems. Standard PDIP-40 package for breadboarding and through-hole assembly. PINOUT No. Symbol Function 1, 2, 5, 37–39 PC0–PC5 6-bit I/O port or control lines. 3 TIMER IN Timer clock input. 4 RESET Reset input. 6 TIMER OUT Timer counter output. 7 I/O / M I/O or memory select input. 8 CE / CE Chip enable input. 9 RD Read strobe input. 10 WR Write strobe input. 11 ALE Address low enable input. 12–19 AD0–AD7 Low address / data bus I/O. 20 VSS Ground. 21–28 PA0–PA7 8-bit I/O port A. 29–36 PB0–PB7 8-bit I/O port B. 40 VCC +5 V power supply. Specifications Parameter Value Memory Organization 256×8 Total Memory 2048bits I/O Ports 2×8bit + 1×6bit Timer 14-bit programmable binary counter/timer Supply Voltage 5VDC Interface Multiplexed address/data bus with ALE Logic Compatibility TTL-level control signals Access Time ≈200–330ns Package PDIP-40 Operating Temperature −40°Cto+85°C Note: for full specifications, check any of the datasheets at the bottom of the page. Applications External RAM and port expansion for legacy 8-bit microprocessor systems. I/O aggregation for control panels, data-acquisition front ends, and instrumentation. Timer/counter functions for event counting, PWM generation, and timed control tasks. Prototyping, education, and repair of vintage microcomputer and embedded systems. Package Contents 1x 8155 2048-Bit Static MOS RAM with I/O Ports and Timer PDIP-40. Documents Datasheet 1 M5L8155P Datasheet 2 D8155HC-2 Datasheet 3 TMP8155P-2 Note: different datasheets are for different manufacturers, yet they are all compatible.

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