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54LVXC4245 데이터시트 PDF




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부품번호 54LVXC4245 기능
기능 8-Bit Dual Supply Configurable Voltage Interface Transceiver
제조업체 National Semiconductor
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54LVXC4245 데이터시트, 핀배열, 회로
www.DataSheet4U.com
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




54LVXC4245 pdf, 반도체, 판매, 대치품
DC Electrical Characteristics (Continued)
Symbol
Parameter
VCCA
(V)
VCCB
(V)
VOLA
VOLB
IIN
IOZA
IOZB
ICC
ICCA1
Maximum Low Level
Output Voltage
Maximum Input Leakage
Current @ OE, T/R
Maximum TRI-STATE
Output Leakage @ An
Maximum TRI-STATE
Output Leakage @ Bn
Maximum
All
Inputs
ICC/Input
Bn
Quiescent VCCA
Supply Current as B Port Floats
4.5 2.7
5.5 5.5
4.5 3.0
4.5 4.5
4.5 2.7
5.5 5.5
4.5 2.7
4.5 3.0
4.5 3.0
4.5 4.5
5.5 3.6
5.5 5.5
5.5 3.6
5.5 5.5
5.5 3.6
5.5 5.5
5.5 5.5
5.5 3.6
5.5 Open
TA = −55˚C to
+125˚C
Guaranteed Limits
0.1
0.1
0.4
0.4
0.1
0.1
0.3
0.3
0.4
0.4
±1.0
±1.0
±5.0
±5.0
±5.0
±5.0
1.5
0.5
40
ICCA2
Quiescent VCCA
Supply Current
5.5 3.6
5.5 5.5
40
40
ICCB
Quiescent VCCB
Supply Current
5.5 3.6
5.5 5.5
10
40
VOLPA
VOLPB
VOLVA
VOLVB
Quiet Output Maximum
Dynamic VOL
Quiet Output Minimum
Dynamic VOL
5.0 3.3
5.0 5.0
5.0 3.3
5.0 5.0
5.0 3.3
5.0 5.0
5.0 3.3
5.0 5.0
1.5
1.5
0.8
1.5
-1.1
-1.2
-0.7
-1.1
Note 3: Max number of outputs defined as (n). Data inputs are driven 0V to VCC level; one output at GND.
Units
V
V
µA
µA
µA
mA
mA
µA
µA
µA
V
V
V
V
Conditions
IOL = 100 µA
IOL = 100 µA
IOL = 24 mA
IOL = 24 mA
IOL = 100 µA
IOL = 100 µA
IOL = 12 mA
IOL = 12 mA
IOL = 24 mA
IOL = 24 mA
VI = VCCA, GND
VI = VIL, VIH
OE = VCCA
VO = VCCA, GND
VI = VIL, VIH,
OE = VCCA
VO = VCCB, GND
VI = VCC − 2.1V
VI = VCCB − 0.6V
An = VCCA or GND
Bn = Open, OE =
VCCA
T/R = VCCA, VCCB =
Open
An = VCCA or GND
Bn = VCCB or GND
OE = GND, T/R =
GND
An = VCCA or GND
Bn = VCCB or GND
OE = GND, T/R =
VCCA
(Note 3)
(Note 3)
(Note 3)
(Note 3)
www.national.com
4

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54LVXC4245 전자부품, 판매, 대치품
Configurable I/O Application for
mixed or unknown Voltages
(Continued)
Additionally, the LVXC4245 solves two other unique prob-
lems: when interfacing to non-TTL compatible signals or
when interfacing to components or busses which are pulled
up to 5V.
In the first case, when interfacing to non-TTL inputs such as
ACMOS or HCMOS where full 5V signal swings are needed,
the LVXC4245 can act as an amplifier to translate 0 volt to 3
volt signals up to 0 volt to 5 volt levels as shown in Figure 2.
DS101033-5
FIGURE 2. LVXC4245 amplifies 3V signals for interfacing to non-TTL inputs.
In the second case, when interfacing to busses which use re-
sistive pull-ups to 5V, it is desirable to avoid connecting 3V
devices directly to the bus to avoid excessive power con-
sumption. The LVXC4245 can be used to translate the 3 volt
signals to 5 volt levels and eliminate the power consumed by
the pull-up resistors.
DS101033-6
FIGURE 3. LVXC4245 for interfacing to 5V busses with pull-ups minimizes power consumption.
7 www.national.com

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관련 데이터시트

부품번호상세설명 및 기능제조사
54LVXC4245

8-Bit Dual Supply Configurable Voltage Interface Transceiver

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National Semiconductor
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54LVXC4245 8-Bit Dual Supply Config Volt Interface Transcvr w/TRI-STATE Outputs (Rev. A)

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