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PDF MC74LVXC3245 Data sheet ( Hoja de datos )
| Número de pieza | MC74LVXC3245 | |
| Descripción | LOW-VOLTAGE CMOS | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Advance Information
Configurable Dual Supply
Octal Transceiver
with 3-State Outputs for 3V Systems
The 74LVXC3245 is a 24–pin dual–supply, octal configurable voltage
interface transceiver especially well 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. The B port is configured to track the VCCB supply level. A 5V
level on the VCCB pin will configure the I/O pins at a 5V level and a 3V
VCCB will configure the I/O pins at a 3V level. The A port interfaces with a
3V host system and the B port to the card slots. 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. The Transmit/Receive (T/R) input determines the
direction of data flow. Transmit (active–High) enables data from the A port
to B port. Receive (active–Low) enables data from the B port to the A port.
• Bidirectional Interface Between 3V and 3V/5V Buses
• Control Inputs Compatible with TTL Level
• Outputs Source/Sink Up to 24mA
• Guaranteed Simultaneous Switching Noise Level and Dynamic
Threshold Performance
• Available in SOIC and TSSOP Packages
• Flexible VCCB Operating Range
• Allows B Port and VCCB to Float Simultaneously When OE Is High
• Functionally Compatible with the 74 Series 245
MC74LVXC3245
LVX
LOW–VOLTAGE CMOS
DW SUFFIX
24–LEAD PLASTIC WIDE SOIC PACKAGE
CASE 751E–04
DT SUFFIX
24–LEAD PLASTIC TSSOP PACKAGE
CASE 948H–01
VCCB NC OE B0 B1 B2 B3 B4 B5 B6 B7 GND
24 23 22 21 20 19 18 17 16 15 14 13
1 2 3 4 5 6 7 8 9 10 11 12
VCCA T/R A0 A1 A2 A3 A4 A5 A6 A7 GND GND
Figure 1. 24–Lead Pinout (Top View)
PIN NAMES
Pins
Function
OE
T/R
A0–A7
B0–B7
Output Enable Input
Transmit/Receive Input
Side A 3–State Inputs or 3–State
Outputs
Side B 3–State Inputs or 3–State
Outputs
This document contains information on a new product. Specifications and information herein are subject to
change without notice.
7/97
© Motorola, Inc. 1997
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MC74LVXC3245
AC ELECTRICAL CHARACTERISTICS
Symbol
Parameter
TA = –40 to +85°C; CL = 50pF
VCCA = 2.7–3.6V
VCCB = 4.5–5.5V
VCCA = 2.7–3.6V
VCCB = 3.0–3.6V
Typ
Min (Note 4.) Max
Typ
Min (Note 5.) Max
Unit
tPHL
tPLH
Propagation Delay A to B
1.0 4.8 8.5 1.0 5.5 9.0 ns
1.0 3.9 7.0 1.0 5.2 8.5
tPHL
tPLH
Propagation Delay B to A
1.0 3.8 7.0 1.0 4.4 7.5 ns
1.0 4.3 8.0 1.0 5.1 8.0
tPZL
tPZH
Output Enable Time OE to B
1.0 4.7 8.5 1.0 6.0 9.5 ns
1.0 4.8 9.0 1.0 6.1 10.0
tPZL
tPZH
Output Enable Time OE to A
1.0 5.9 10.0 1.0 6.4 10.5 ns
1.0 5.4 9.5 1.0 5.8 9.5
tPHZ
tPLZ
Output Disable Time OE to B
1.0 4.0 8.5 1.0 6.3 10.0 ns
1.0 3.8 8.0 1.0 4.5 8.5
tPHZ
tPLZ
Output Disable Time OE to A
1.0 4.6 10.0 1.0 5.2 10.0 ns
1.0 3.1 7.0 1.0 3.4 7.0
tOSHL
tOSLH
Output to Output Skew, Data to Output
(Note NO TAG)
1.0 1.5
1.0 1.5 ns
4. Typical values at VCCA = 3.3V, VCCB = 5.0V at 25°C.
5. Typical values at VCCA = 3.3V, VCCB = 3.3V at 25°C.
6. 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 specification applies to any outputs switching in the same direction, either HIGH–to–LOW (tOSHL) or LOW–to–HIGH (tOSLH); parameter
guaranteed by design.
CAPACITIVE CHARACTERISTICS
Symbol
Parameter
CIN
CI/O
CPD
Input Capacitance
Input/Output Capacitance
Power Dissipation Capacitance
(Measured at 10MHz)
A→B
B→A
Condition
VCCA = 3.3V; VCCB = 5.0V
VCCA = 3.3V; VCCB = 5.0V
VCCB = 5.0V
VCCA = 3.3V
Typical
4.5
10
50
40
Unit
pF
pF
pF
LVX Data — Low–Voltage CMOS Logic
BR1492 — Rev 0
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MOTOROLA
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