8T95, 8T96, 8T97, 8T98 Each of the 3-state bus interface elements described herein has low current PNP inputs and is designed with Schottky TTL technology for ultra high speed. The devices are used&n ...

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8T95, 8T96, 8T97, 8T98

Each of the 3-state bus interface elements described herein has low current PNP inputs and is designed with Schottky TTL technology for ultra high speed. The devices are used  to convert TTL/DTL or MOS/CMOS 3-state TTL bus levels. 

For maximum systems flexibility, the 8T95 and 8T97 do so without logic inversion, whereas the 8T96 and 8T98 provide the logical complement of the input. The 8T95 and 8T96 feature a common control line tor all six devices, whereas the 8T97 and 8T98 have control lines for four devices from one input and two from another input.

8T98 typical propagation delay: 6,5ns

8T98 typical supply current range: 59mA

ASSOLUTE  MAXIMUM RATINGS (Over operating free-air temperature range unless otherwise noted.)

PARAMETERSSTNSTUNIT

VccSupply voltage7.07.0V

V1NInput voltage-0.5 IO  +5.5-0.5 to +5.5V

l1NInput current-30 to +5-30 IO  +5mA

loLContinuous100100mA

VourVoltage appliedlo output in HIGH outputstate-0.5 IO  +Vcc-0.5 to +VccV

TAOperating free-air temperature range-55 IO + 125o to 70oc

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The R6522 Versatile Interface Adapter (VIA) is a very flexible I/O control device. In addition, this device contains a pair of very powerful 16-tiit interval timers, a senal-to-parallel/para ...

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The R6522 Versatile Interface Adapter (VIA) is a very flexible I/O control device. In addition, this device contains a pair of very powerful 16-tiit interval timers, a senal-to-parallel/parallel-to serial shift register and input data latching on the peripheral ports.

Expanded handshaking capability allows control of bidirectional data transfers between VIA's in multiple processor systems.

The R6522 includes functions for programmed control of up to two peripheral devices (Ports A and B) These two program controlled 8-bit bidirectional peripheral I/O ports allow direct interfacing between the microprocessor and selected peripheral units. Each port has input data latching capability. Two programmable Data Direction Registers (A and B) allow selection of data direction (input or output) on an individual line basis.

The R6522 also has two programmable 16-bit Interval Timer/Counters with latches. Timer 1 may be operated in a OneShot Interrupt Mode with interrupts on each count-to-zero. or in a Free-Run Mode with a continuous series of evenly spaced interrupts. Timer 2 functions as both an interval and pulse counter Serial data transfers are provided by a serial-toparallel/parallei-to-senal shift register. Application versatility is further increased by various control registers, including—the Interrupt Flag Register, the Interrupt Enable Register, the Auxiliary Control Register and the Peripheral Control Register.

Features

• Two 8-bit bidirectional I/O ports

• Two 16-bit programmable timer/counters .

• Serial bidirectional peripheral I/O

• TTL compatible peripheral control lines

• Expanded "handshake” capability allows positive control of

data transfers between processor and penpheral devices

• Latched output and input registers on both I/O ports

• 1 and 2 MHz operation

• Commercial and industrial temperature range versions

• Single + 5 Vdc power requirement

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