Datasheet

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February 1994

Revised October 2003

74LVXC4245 8-Bit Dual Supply Configurable Voltage Interface Transceiver with 3-STATE Outputs

74LVXC4245

8-Bit Dual Supply Configurable Voltage Interface

Transceiver with 3-STATE Outputs

General Description

The LVXC4245 is a 24-pin dual-supply, 8-bit configurable

voltage interface transceiver suited for PCMCIA and other

real time configurable I/O applications. The V

CCA

accepts a 5V supply level. The “A” Port is a dedicated 5V

port. The V

CCB

pin accepts a 3V-to-5V supply level. The

“B” Port is configured to track the V

CCB

supply level

respectively. A 5V level on the V

pin will configure the

I/O pins at a 5V level and a 3V V

will configure the I/O

pins at a 3V level. This device will allow the V

CCB

voltage

source pin and I/O pins on the “B” Port to float when OE

HIGH. This feature is necessary to buffer data to and from

a PCMCIA socket that permits PCMCIA cards to be

inserted and removed during normal operation.

Features

■ Bidirectional interface between 5V and 3V-to-5V buses

■ Control inputs compatible with TTL level

■ Outputs source/sink up to 24 mA

■ Guaranteed simultaneous switching noise level and

dynamic threshold performance

■ Implements patented EMI reduction circuitry

■ Flexible V

CCB

operating range

■ Allows B Port and V

CCB

to float simultaneously when OE

is HIGH

■ Functionally compatible with the 74 series 245

Ordering Code:

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Logic Symbol

Pin Descriptions

Connection Diagram

Order Number Package Number Package Description

74LVXC4245WM M24B 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide

74LVXC4245QSC MQA24 24-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150" Wide

74LVXC4245MTC MTC24 24-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Pin Names Description

Output Enable Input

T/R

Transmit/Receive Input

–A

Side A Inputs or 3-STATE Outputs

–B

Side B Inputs or 3-STATE Outputs

Summary of content (8 pages)

PAGE 1
Revised October 2003 74LVXC4245 8-Bit Dual Supply Configurable Voltage Interface Transceiver with 3-STATE Outputs General Description Features The LVXC4245 is a 24-pin dual-supply, 8-bit configurable voltage interface transceiver suited for PCMCIA and other real time configurable I/O applications. The VCCA pin accepts a 5V supply level. The “A” Port is a dedicated 5V port. The VCCB pin accepts a 3V-to-5V supply level. The “B” Port is configured to track the VCCB supply level respectively.
PAGE 2
74LVXC4245 Truth Table Inputs OE Outputs T/R L L Bus B Data to Bus A L H Bus A Data to Bus B H X HIGH-Z State H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Logic Diagram www.fairchildsemi.
PAGE 3
Recommended Operating Conditions (Note 2) −0.5V to +7.0V Supply Voltage (VCCA,VCCB) DC Input Voltage (VI) @ OE, T/R −0.5V to VCCA +0.5V Supply Voltage DC Input/Output Voltage (VI/O) 4.5V to 5.5V VCCA VCCB 2.7V to 5.5V @ An −0.5V to VCCA +0.5V Input Voltage (VI) @ OE, T/R @ Bn −0.5V to VCCB +0.
PAGE 4
74LVXC4245 DC Electrical Characteristics Symbol IOZA IOZB Parameter (Continued) VCCA VCCB (V) (V) TA = +25°C Typ TA = −40°C to +85°C Units Maximum 3-STATE 5.5 3.6 ±0.5 ±5.0 Output Leakage @ An 5.5 5.5 ±0.5 ±5.0 Maximum 3-STATE 5.5 3.6 ±0.5 ±5.0 Output Leakage @ Bn 5.5 5.5 ±0.5 ±5.0 1.35 1.5 mA 0.35 0.5 mA ∆ICC Maximum All Inputs 5.5 5.5 ICC/Input Bn 5.5 3.6 ICCA1 Quiescent VCCA Supply Current as B 1.0 µA µA 5.
PAGE 5
Symbol CL = 50 pF CL = 50 pF VCCA = 4.5V to 5.5V VCCA = 4.5V to 5.5V VCCB = 4.5V to 5.5V Parameter TA = +25°C Min Typ VCCB = 2.7V to 3.6V TA = −40°C to +85°C Max Min TA = +25°C Max Min (Note 6) Typ TA = −40°C to +85°C Max Min Units Max (Note 7) tPHL Propagation 1.0 4.9 6.5 1.0 7.0 1.0 5.5 7.5 1.0 8.0 tPLH Delay A to B 1.0 4.0 5.5 1.0 6.0 1.0 5.0 7.0 1.0 7.5 tPHL Propagation 1.0 4.7 6.5 1.0 7.0 1.0 5.6 7.5 1.0 8.0 tPLH Delay B to A 1.0 3.9 5.0 1.
PAGE 6
74LVXC4245 Configurable I/O Application for PCMCIA Cards Block Diagram The LVXC4245 is a 24-pin dual supply device well suited for PCMCIA configurable I/O applications. Ideal for low power notebook designs, the LVXC4245 consumes less than 1 mW of quiescent power in all modes of operation. The LVXC4245 meets all PCMCIA I/O voltage requirements at 5V and 3.3V operation. By tying VCCB of the LVXC4245 to the card voltage supply, the PCMCIA card www.fairchildsemi.
PAGE 7
4LVXC4245 Physical Dimensions inches (millimeters) unless otherwise noted 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide Package Number M24B 24-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150" Wide Package Number MQA24 7 www.fairchildsemi.
PAGE 8
74LVXC4245 8-Bit Dual Supply Configurable Voltage Interface Transceiver with 3-STATE Outputs Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 24-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC24 Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.