74LVCH322245A datasheet(2/16 Pages) PHILIPS

Il numero della parte	74LVCH322245A

Spiegazioni elettronici	32-bit bus transceiver with direction pin; 30 ohm series termination resistors; 5 V tolerant; 3-state

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Produttore elettronici	PHILIPS [NXP Semiconductors]

Homepage	http://www.nxp.com

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1999 Sep 01

2

Philips Semiconductors

Product speciﬁcation

32-bit bus transceiver with direction pin; 30

Ω

series termination resistors; 5 V tolerant; 3-state

74LVC322245A;

74LVCH322245A

FEATURES

• 5 V tolerant inputs/outputs for interfacing with 5 V logic

• Wide supply voltage range of 1.2 to 3.6 V

• Complies with JEDEC standard no. 8-1A

• CMOS low power consumption

• MULTIBYTE™ flow-trough standard pin-out architecture

• Low inductance multiple power and ground pins for

minimum noise and ground bounce

• Direct interface with TTL levels

• Bus hold on data inputs (74LVCH322245A only)

• Integrated 30 Ω termination resistors

• Typical output ground bounce voltage:

VOLP <0.8 V at VCC = 3.3 V; Tamb =25 °C

• Typical output VOH undershoot voltage:

VOHV >2VatVCC = 3.3 V; Tamb =25 °C

• Power-off disabled outputs, permitting live insertion

• Plastic fine-pitch ball grid array package.

DESCRIPTION

The 74LVC(H)322245A is a high-performance, low-power,

low-voltage, Si-gate CMOS device, superior to most

advanced CMOS compatible TTL families. Inputs can be

driven from either 3.3 or 5 V devices. In 3-state operation,

outputs can handle 5 V. These features allow the use of

these devices in a mixed 3.3 and 5 V environment.

The 74LVC(H)322245A is a 32-bit transceiver featuring

non-inverting 3-state bus compatible outputs in both send

and receive directions. The 74LVC(H)322245A features

two output enable (nOE) inputs for easy cascading and

two send or receive (nDIR) inputs for direction control.

nOE controls the outputs so that the buses are effectively

isolated. The 74LVC(H)322245A is designed with 30

Ω

series termination resistors in both HIGH and LOW output

stages to reduce line noise.

To ensure the high-impedance state during power-up or

power-down, input nOE should be tied to VCC through a

pull-up resistor; the minimum value of the resistor is

determined by the current-sinking capability of the driver.

The 74LVCH322245A bus hold data inputs eliminates the

need for external pull-up resistors to hold unused or

floating data inputs at a valid logic level (see Fig.2).

QUICK REFERENCE DATA

Ground = 0 V; Tamb =25 °C; tr =tf ≤ 2.5 ns.

Note

1. CPD is used to determine the dynamic power dissipation (PD in µW).

PD =CPD × VCC2 × fi + Σ(CL × VCC2 × fo) where:

fi = input frequency in MHz;

fo = output frequency in MHz;

CL = output load capacitance in pF;

VCC = supply voltage in Volts;

Σ(CL × VCC2 × fo) = sum of the outputs.

SYMBOL

PARAMETER

CONDITIONS

TYPICAL

UNIT

tPHL/tPLH

propagation delay

nAn to nBn;nBn to nAn

CL = 50 pF; VCC = 3.3 V

3.3

ns

CI

input capacitance

5.0

pF

CI/O

input/output capacitance

10

pF

CPD

power dissipation capacitance per

buffer

VI = GND to VCC; note 1

28

pF

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