2114A - 1024x4 bit Static RAM

Pinout of 2114A

Description

The 2114A is a 4096-bit static Random Access Memory organized as 1024 words by 4-bits. It uses fully DC stable (static) circuitry throughout, in both the array and the decoding, therefore it requires no clocks or refreshing to operate. Data access is particularly simple since address setup times are not required. The data is read out nondestructively and has the same polarity as the input data. Common input/output pins are provided.

  • Access Time

    • 2114AL-1 - 100ns Max (40ma Max)

    • 2114AL-2 - 120ns Max (40ma Max)

    • 2114AL-3 - 150ns Max (40ma Max)

    • 2114AL-4 - 200ns Max (40ma Max)

    • 2114A-4 - 200ns Max (70ma Max)

    • 2114A-5 - 250ns Max (70ma Max)

  • Fully TTL compatible

  • Common Data Input and Output using Three-State Outputs

  • Single Supply (Vcc = +5V +-10%)

  • Power Dissipation = 1.0W

Pin Names

A0 - A9 Address Inputs

I/O1 - I/O4 Data Input/Output

WE* Write Enable Input (Active LOW)

CS* Chip Select Input (Active LOW)

Vcc Power (+5Vdc)

GND Ground (0Vdc)

Operating Characteristics

Vcc = 5V +- 5%

GND = 0V

Supply Current = 70mA max

Read Timing (2114AL-1)

Read Cycle Time = 100ns min

Access Time = 100ns max

Chip Selection to Output Valid = 70ns max

Chip Selection to Output Active = 10ns min

Output 3-state from Deselection = 30ns max

Output Hold from Address Change = 15ns min

Write Timing

Write Cycle Time = 100ns min

Write Time = 75ns min

Write Release Time = 0ns min

Output 3-state from Write = 30ns max

Data to Write Time Overlap = 70ns min

Data Hold from Write Time = 0ns min

Used In

Bally/Midway - TRON, Two Tigers, Kickman, Satan's Hollow, Timber, Wacko, etc.

Atari - Asteroids, Battlezone, Space Duel, Tempest, Dig Dug, etc.

Cross-references to

Seiko/Epson SRM2114C

United Microelectronics Corporation UM6104

Intel 2114A (out of production)

AMD AM9114 (out of production)

Hitachi HM472114P (out of production)

Can substitute:

2148 or 2149 devices. (The 2148 is pin compatible, but much faster. The 2149 is faster and does not support a powerdown mode, which most likely isn't needed in a video game. Check that there isn't a battery backup system to any 2114's or 2148's before substituting 2149's or you might run down your batteries...)

Source of information

Intel Memory Components Handbook, 1983

United Microelectronics Corporation Memory ICs Data Book, 1990-1991