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Last update: 13 May 2010

IC number:6540
IC function:16 kbit (2k×8) ROM with five chip selects
Related components:16 kbit (2k×8) ROM with two chip selects

Component documentation
IC numberManufacturerDocumentation
6540MOS TechnologyPreliminary Datasheet July 1977

Component versions
IC numberPackageAccess time
654028-pin DIP300 ns

Programmed components
IC numberCBM part numberCBM part descriptionChip description

Positions
DevicePosition

Pinout
PinTypeName
1PowerVSS
2..4InputCS5..CS3
5..10InputA0..A5
11InputA9
12PowerVCC
13..15InputA8..A6
16InputØ2
17InputCS1
18InputA10
19..26I/ODB7..DB0
27InputCS2
28N/CNC

Details

The 6540 16K Read Only Memory is a monolithic N-channel metal-gate array manufactured with a low-threshold process and utilizing both enhancement and depletion mode MOS transistors.

Three-state outputs provide bus-compatibility with microprocessor-based memory systems. The ROM's are organized as 2048 words of 8 bits each.

Mask options provide user specification of chip select equations, allowing addressing anywhere within a 65K memory space without external decode circuitry.

Features

  • Interfaces with TTL, DTL or MOS
  • Single +5V supply
  • High speed operation (300 ns access)
  • Three-state outputs
  • Complete address control
  • No external components required
  • No system slow-down
  • Five chip selects
  • Block diagram

    6540 block diagram

    Maximum ratings

    Maximum ratings
    RatingSymbolVoltageUnit
    Supply VoltageVCC-0.3 to +7.0V
    Input/Output VoltageVIN-0.3 to +7.0V
    Operating TemperatureTOP0 to 70°C
    Storage TemperatureTSTG-55 to +150°C

    Electrical Characteristics

    Electrical Characteristics (VCC = 5.0 V ± 5% VSS = 0 V; TA = 25°C)
    CharacteristicSymbolMin.Typ.Max.Unit
    Input High VoltageVIHVSS+2.0-VCCV
    Input Low VoltageVIHVSS-.3-VSS+.8V
    Input Leakage Current (A0-A10, CS1, CS2, Ø2)IIN1.02.5µA
    Input Current for High Impedance (Three State) Outputs: VIN = 0.4V to 2.4VITSI1.010µA
    Output High Voltage: VCC = Min ILOAD <= -100µAVOHVSS+2.4V
    Output Low Voltage: VCC = Min ILOAD <= 1.6mAVOLVSS+.4V
    Output Low Current (sinking) VOL <= .4VIOL1.6mA
    Supply CurrentICC110150mA

    Timing

    6540 timing diagram

    6540 timing diagram

    Copyright © 2005-2010 Ronald van Dijk - All rights reserved
    Sources:
    MOS Technology 6540/6541 Preliminary Datasheet July 1977