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PDF 54LVXC4245 Data sheet ( Hoja de datos )
| Número de pieza | 54LVXC4245 | |
| Descripción | 8-Bit Dual Supply Configurable Voltage Interface Transceiver | |
| Fabricantes | National Semiconductor | |
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March 1999
54LVXC4245
8-Bit Dual Supply Configurable Voltage Interface
Transceiver with TRI-STATE® Outputs
General Description
The LVXC4245 is a 24-pin dual-supply, 8-bit configurable
voltage interface transceiver suited for 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 config-
ure 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 socket that permits live insertion and removal during
normal operation.
Features
n Bidirectional interface between 5V and 3V-to-5V buses
n Control inputs compatible with TTL level
n Outputs source/sink up to 24 mA
n Available in Cerpack and CDIP packages
n Implements patented EMI reduction circuitry
n Flexible VCCB operating range
n Allows B port and VCCB to float simultaneously when OE
is HIGH
n Functionally compatible with the 54 series 245
n Standard Microcircuit Drawing (SMD) 5962-9862001
Ordering Code
Order Number
54LVXC4245W-QML
54LVXC4245J-QML
Package Number
W24C
J24F
Package Description
24-Lead Ceramic Flatpack
24-Lead Ceramic Dual-in-line
Logic Symbol
Connection Diagram
Pin Assignment
for Cerpack and CDIP
DS101033-1
Pin Descriptions
Pin Names
OE
T/R
A0– A7
B0– B7
Description
Output Enable Input
Transmit/Receive Input
Side A Inputs or TRI-STATE Outputs
Side B Inputs or TRI-STATE Outputs
DS101033-2
TRI-STATE® is a registered trademark of National Semiconductor Corporation
© 1999 National Semiconductor Corporation DS101033
www.national.com
1 page  
AC Electrical Characteristics
Symbol
Parameter
CL = 50 pF
VCCA = 4.5V to 5.5V
VCCB = 4.5V to 5.5V
TA = −55˚C to +125˚C
Min Max
CL = 50 pF
VCCA = 4.5V to 5.5V
VCCB = 2.7V to 3.6V
TA = −55˚C to +125˚C
Min Max
Units
tPHL Propagation
1.0
8.0
1.0
9.5 ns
tPLH Delay A to B
1.0
8.0
1.0
9.5
tPHL Propagation
1.0
8.0
1.0
9.5 ns
tPLH Delay B to A
1.0
8.0
1.0
9.5
tPZL Output Enable
1.0
9.5
1.0
12.0
ns
tPZH
Time OE to B
1.0
9.5
1.0 12.0
tPZL Output Enable
1.0
11.5
1.0
13.0
ns
tPZH
Time OE to A
1.0
11.5
1.0
13.0
tPHZ Output Disable
1.0
7.0
1.0
7.5 ns
tPLZ Time OE to B
1.0
7.0
1.0
7.5
tPHZ Output Disable
0.5
7.0
0.5
7.0 ns
tPLZ Time OE to A
0.5
7.0
0.5
7.0
tOSHL
Output to Output
tOSLH
Skew (Note 4)
1.5
1.5 ns
Data to Output
Note 4: Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The speci-
fication applies to any outputs switching in the same direction, either HIGH to LOW (tOSHL) or LOW to HIGH (tOSLH). Parameter guaranteed by design.
Capacitance
Symbol
CIN
CI/O
CPD
Parameter
Input Capacitance
Input/Output Capacitance
Power Dissipation Capacitance
Note 5: CPD is measured at 10 MHz.
A→B
B→A
Max
10
12
50
50
Units
pF
pF
pF
pF
Conditions
VCC = Open
VCCA = 5V, VCCB = 3.3V
VCCA = 5V
VCCB = 3.3V
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| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet 54LVXC4245.PDF ] | |
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