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February 2009

74LVXC3245 — 8-Bit Dual Supply Configurable Voltage Interface Transceiver with 3-STATE Outputs

74LVXC3245

8-Bit Dual Supply Configurable Voltage Interface

Transceiver with 3-STATE Outputs

Features

■ Bidirectional interface between 3V 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

■ 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

General Description

The LVXC3245 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 3V supply level. The A Port is a dedicated 3V

port. The V

CCB

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

Port is configured to track the V

CCB

supply level respec-

tively. 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. The A Port should interface with a 3V host system

and the B Port to the card slots. This device will allow the

CCB

voltage source pin and I/O pins on the B Port to float

when OE

is 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.

Ordering Code:

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

Logic Symbol/s

Pin Descriptions

Connection Diagram/s

Order Number Package Number Package Description

74LVXC3245WM M24B 224-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide

74LVXC3245QSC MQA24 24-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150" Wide

74LVXC3245MTC 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

■ Implements proprietary EMI reduction circuitry

Summary of content (9 pages)

PAGE 1
74LVXC3245 8-Bit Dual Supply Configurable Voltage Interface Transceiver with 3-STATE Outputs Features General Description ■ Bidirectional interface between 3V and 3V-to-5V buses ■ Control inputs compatible with TTL level The LVXC3245 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 3V supply level. The A Port is a dedicated 3V port. The VCCB pin accepts a 3V-to-5V supply level.
PAGE 2
Inputs Outputs OE 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/s www.fairchildsemi.
PAGE 3
Recommended Operating Conditions (Note 2) −0.5V to +7.0V Supply Voltage (VCCA, VCCB) −0.5V to VCCA +0.5V DC Input Voltage (VI) @ OE, T/R Supply Voltage DC Input/Output Voltage (VI/O) @ An −0.5V to VCCA +0.5V @ Bn −0.5V to VCCB +0.5V VCCA 2.7V to 3.6V VCCB 3.0V to 5.
PAGE 4
74LVXC3245 DC Electrical Characteristics Symbol IOZA Parameter (Continued) VCCA VCCB (V) (V) TA = 25°C Typ TA = −40°C to +85°C Units Maximum 3-STATE 3.6 3.6 ±0.5 ±5.0 Output Leakage 3.6 5.5 ±0.5 ±5.0 Maximum 3-STATE 3.6 3.6 ±0.5 ±5.0 Output Leakage 3.6 5.5 ±0.5 ±5.0 1.35 1.5 VI = VIL, VIH, µA VI = VIL, VIH, µA ICCA1 Maximum Bn 3.6 5.5 ICC/Input All Inputs 3.6 3.6 0.35 0.5 1.0 3.
PAGE 5
Symbol Parameter TA = +25°C TA = −40°C to +85°C TA = +25°C CL = 50 pF CL = 50 pF CL = 50 pF CL = 50 pF VCCA = 2.7V–3.6V VCCA = 2.7V–3.6V VCCA = 2.7V–3.6V VCCA = 2.7V–3.6V VCCB = 4.5V–5.5V VCCB = 4.5V–5.5V VCCB = 3.0V–3.6V VCCB = 3.0V–3.6V Min Typ Max Min Max Min Typ (Note 6) TA = −40°C to +85°C Max Min Units Max (Note 7) tPHL Propagation Delay 1.0 4.8 8.0 1.0 8.5 1.0 5.5 8.5 1.0 9.0 tPLH A to B 1.0 3.9 6.5 1.0 7.0 1.0 5.2 8.0 1.0 8.
PAGE 6
74LVXC3245 Power Up Considerations figured as inputs. With VCCA receiving power first, the A I/O Port should be configured as inputs to help guard against bus contention and oscillations. To insure the system does not experience unnecessary ICC current draw, bus contention, or oscillations during power up, the following guidelines should be adhered to (refer to Table 1): • A side data inputs should be driven to a valid logic level. This will prevent excessive current draw.
PAGE 7
4LVXC3245 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
74LVXC3245 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.
PAGE 9
74LVXC3245 — 8-Bit Dual Supply Configurable Voltage Interface Transceiver with 3-STATE Outputs www.fairchildsemi.