INDUSTRIALTEMPERATURERANGE

IDT74ALVCHR16601

3.3VCMOS18-BITUNIVERSALBUSTRANSCEIVERWITH3-STATEOUTPUTS

1

JANUARY 2004

INDUSTRIAL TEMPERATURE RANGE

The IDT logo is a registered trademark of Integrated Device Technology, Inc.

© 2004 Integrated Device Technology, Inc.

DSC-4491/3

FEATURES:

• 0.5 MICRON CMOS Technology

• ESD > 2000V per MIL-STD-883, Method 3015; > 200V using

machine model (C = 200pF, R = 0)

• CMOS power levels (0.4

µµµµµ W typ. static)

• Rail-to-Rail output swing for increased noise margin

• Available in TSSOP package

FUNCTIONAL BLOCK DIAGRAM

IDT74ALVCHR16601

3.3V CMOS 18-BIT UNIVERSAL

BUS TRANSCEIVER WITH

3-STATE OUTPUTS

AND BUS-HOLD

APPLICATIONS:

• 3.3V high speed systems

• 3.3V and lower voltage computing systems

DRIVE FEATURES:

• Balanced Output Drivers: ±12mA

• Low Switching Noise

LEAB

CLKBA

OEBA

LEBA

CLKAB

TO 17 OTHER CHANNELS

CE

1D

C1

CE

1D

C1

CLK

CLKENAB

OEAB

CLKENBA

27

29

30

2

28

55

56

1

3

54

CLK

DESCRIPTION:

This 18-bit universal bus transceiver is built using advanced dual metal

CMOS technology. The transceiver combines D-type latches and D-type

flip-flops to allow data flow in transparent, latched, and clocked modes.

Data flow in each direction is controlled by output-enable (OEAB and

OEBA), latch-enable (LEAB and LEBA), and clock (CLKAB and CLKBA)

inputs. The clock can be controlled by the clock-enable (CLKENAB and

CLKENBA) inputs. For A-to-B data flow, the device operates in the

transparent mode when LEAB is high. When LEAB is low, the A data is

latched if CLKAB is held at a high or low logic level. If LEAB is low, the data

is stored in the latch/flip-flop on the low-to-high transition of CLKAB. Output

enable OEAB is active low. When OEAB is low, the outputs are active. When

OEAB is high, the outputs are in the high-impedance state.

DataflowforBtoAissimilartothatofAtoBbutusesOEBA,LEBA,CLKBA

and CLKENBA.

The ALVCHR16601 has series resistors in the device output structure

which will significantly reduce line noise when used with light loads. This

The ALVCHR16601 has “bus-hold” which retains the inputs’ last state

whenever the input goes to a high impedance. This prevents floating inputs

and eliminates the need for pull-up/down resistors.