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



Fairchild Semiconductor 로고
Fairchild Semiconductor
74LVXC4245MTC 데이터시트, 핀배열, 회로
February 1994
Revised July 1999
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 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. A 5V level on the VCC pin will configure the
I/O pins at a 5V level and a 3V VCC will configure the I/O
pins at a 3V level. This device will allow the VCCB 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.
Features
s Bidirectional interface between 5V and 3V-to-5V buses
s Control inputs compatible with TTL level
s Outputs source/sink up to 24 mA
s Guaranteed simultaneous switching noise level and
dynamic threshold performance
s Implements patented EMI reduction circuitry
s Flexible VCCB operating range
s Allows B Port and VCCB to float simultaneously when OE
is HIGH
s Functionally compatible with the 74 series 245
Ordering Code:
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
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbol
Connection Diagram
Pin Descriptions
Pin Names
OE
T/R
A0–A7
B0–B7
Description
Output Enable Input
Transmit/Receive Input
Side A Inputs or 3-STATE Outputs
Side B Inputs or 3-STATE Outputs
© 1999 Fairchild Semiconductor Corporation DS012009
www.fairchildsemi.com


74LVXC4245MTC 데이터시트, 핀배열, 회로
Truth Table
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Logic Diagram
Inputs
OE T/R
LL
LH
HX
Outputs
Bus B Data to Bus A
Bus A Data to Bus B
HIGH-Z State
www.fairchildsemi.com
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74LVXC4245MTC transceiver

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74LVXC4245MTC

8-Bit Dual Supply Configurable Voltage Interface Transceiver with 3-STATE Outputs - Fairchild Semiconductor