74LVT322245 PDF даташит
Спецификация 74LVT322245 изготовлена «Fairchild Semiconductor» и имеет функцию, называемую «Low Voltage 32-Bit Transceiver with 3-STATE Outputs and 25ohm Series Resistors in A Port Outputs». |
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Детали детали
Номер произв | 74LVT322245 |
Описание | Low Voltage 32-Bit Transceiver with 3-STATE Outputs and 25ohm Series Resistors in A Port Outputs |
Производители | Fairchild Semiconductor |
логотип |
6 Pages
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May 2002
Revised May 2002
74LVT322245 • 74LVTH322245
Low Voltage 32-Bit Transceiver with 3-STATE Outputs
and 25Ω Series Resistors in A Port Outputs
General Description
The LVT322245 and LVTH322245 contain thirty-two non-
inverting bidirectional buffers with 3-STATE outputs and are
intended for bus oriented applications. The device is byte
controlled. Each byte has separate control inputs which
can be shorted together for full 32-bit operation. The T/R
inputs determine the direction of data flow through the
device. The OE inputs disable both the A and B ports by
placing them in a high impedance state.
The LVT322245 and LVTH322245 are designed with
equivalent 25Ω series resistance in both the HIGH and
LOW states on the A Port outputs. This design reduces line
noise in applications such as memory address drivers,
clock drivers, and bus transceivers/transmitters.
The LVTH322245 data inputs include bushold, eliminating
the need for external pull-up resistors to hold unused
inputs.
These non-inverting transceivers are designed for low-volt-
age (3.3V) VCC applications, but with the capability to pro-
vide a TTL interface to a 5V environment. The
LVT322245 and LVTH322245 are fabricated with an
advanced BiCMOS technology to achieve high speed
operation similar to 5V ABT while maintaining a low power
dissipation.
Features
s Input and output interface capability to systems at
5V VCC
s Bushold data inputs eliminate the need for external
pull-up resistors to hold unused inputs (74LVTH322245)
s Also available without bushold feature (74LVT322245)
s Live insertion/extraction permitted
s Power Up/Power Down high impedance provides
glitch-free bus loading
s A Port outputs include equivalent series resistance of
25Ω making external termination resistors unnecessary
and reducing overshoot and undershoot
s A Port outputs source/sink ±12 mA
B Port outputs source/sink −32 mA/+64 mA
s ESD performance:
Human-body model > 2000V
Machine model > 200V
Charged-device model > 1000V
s Packaged in plastic Fine-Pitch Ball Grid Array (FBGA)
Ordering Code:
Order Number Package Number
Package Description
74LVT322245G
(Note 1) (Note 2)
BGA96A
96-Ball Fine-Pitch Ball Grid Array (FBGA), JEDEC MO-205, 5.5mm Wide
(Preliminary)
74LVTH322245G
(Note 1) (Note 2)
BGA96A
96-Ball Fine-Pitch Ball Grid Array (FBGA), JEDEC MO-205, 5.5mm Wide
Note 1: Ordering code “G” indicates TRAYS.
Note 2: Devices also available in TAPE and REEL. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbol
© 2002 Fairchild Semiconductor Corporation DS500408
www.fairchildsemi.com
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Connection Diagram
(Top Thru View)
Truth Tables
Inputs
OE1
L
L
H
T/R1
L
H
X
Inputs
OE2
T/R2
LL
LH
HX
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
Outputs
Bus B0–B7 Data to Bus A0–A7
Bus A0–A7 Data to Bus B0–B7
HIGH-Z State on A0–A7, B0–B7
Outputs
Bus B8–B15 Data to Bus A8–A15
Bus A8–A15 Data to Bus B8–B15
HIGH-Z State on A8–A15, B8–B15
FBGA Pin Descriptions
Pin Names
OEn
T/Rn
A0–A31
B0–B31
Description
Output Enable Input (Active LOW)
Transmit/Receive Input
Side A Inputs/3-STATE Outputs
Side B Inputs/3-STATE Outputs
Pin Assignments for FBGA
123456
A B1 B0 T/R1 OE1 A0 A1
B B3 B2 GND GND A2 A3
C B5 B4 VCC1 VCC1 A4 A5
D B7 B6 GND GND A6 A7
E B9 B8 GND GND A8 A9
F B11 B10 VCC1 VCC1 A10 A11
G B13 B12 GND GND A12 A13
H B14 B15 T/R2 OE2 A15 A14
J B17 B16 T/R3 OE3 A16 A17
K B19 B18 GND GND A18 A19
L B21 B20 VCC2 VCC2 A20 A21
M B23 B22 GND GND A22 A23
N B25 B24 GND GND A24 A25
P B27 B26 VCC2 VCC2 A26 A27
R B29 B28 GND GND A28 A29
T B30 B31 T/R4 OE4 A31 A30
Inputs
OE3
T/R3
LL
LH
HX
Inputs
OE4
T/R4
LL
LH
HX
Outputs
Bus B16–B23 Data to Bus A16–A23
Bus A16–A23 Data to Bus B16–B23
HIGH-Z State on A16–A23, B16–B23
Outputs
Bus B24–B31 Data to Bus A24–A31
Bus A24–A31 Data to Bus B24–B31
HIGH-Z State on A24–A31, B24–B31
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Functional Description
The LVT322245 and LVTH322245 contain thirty-two non-inverting bidirectional buffers with 3-STATE outputs. The device is
byte controlled with each byte functioning identically, but independent of the other. The control pins can be shorted together
to obtain 16-bit or full 32-bit operation.
Logic Diagrams
Byte 1
Byte 3
Byte 2
Byte 4
VCC1 is associated with Bytes 1 and 2.
VCC2 is associated with Bytes 3 and 4.
Note: Please note that these diagrams are provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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Номер в каталоге | Описание | Производители |
74LVT322245 | Low Voltage 32-Bit Transceiver with 3-STATE Outputs and 25 Series Resistors in A Port Outputs | Fairchild Semiconductor |
74LVT322245 | Low Voltage 32-Bit Transceiver with 3-STATE Outputs and 25ohm Series Resistors in A Port Outputs | Fairchild Semiconductor |
74LVT322245G | Low Voltage 32-Bit Transceiver with 3-STATE Outputs and 25 Series Resistors in A Port Outputs | Fairchild Semiconductor |
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