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PDF 6501 Data sheet ( Hoja de datos )
| Número de pieza | 6501 | |
| Descripción | 8-Bit Dual Supply Translating Transceiver with 3-STATE Outputs | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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July 1993
Revised July 1999
74LVX3245
8-Bit Dual Supply Translating Transceiver with
3-STATE Outputs
General Description
The LVX3245 is a dual-supply, 8-bit translating transceiver
that is designed to interface between a 3V bus and a 5V
bus in a mixed 3V/5V supply environment. The Transmit/
Receive (T/R) input determines the direction of data flow.
Transmit (active-HIGH) enables data from A Ports to B
Ports; Receive (active-LOW) enables data from B Ports to
A Ports. The Output Enable input, when HIGH, disables
both A and B Ports by placing them in a high impedance
condition. The A Port interfaces with the 3V bus; the B Port
interfaces with the 5V bus.
The LVX3245 is suitable for mixed voltage applications
such as notebook computers using 3.3V CPU and 5V
peripheral components.
Features
s Bidirectional interface between 3V and 5V buses
s Inputs compatible with TTL level
s 3V data flow at A Port and 5V data flow at B Port
s Outputs source/sink 24 mA
s Guaranteed simultaneous switching noise level and
dynamic threshold performance
s Implements proprietary EMI reduction circuitry
s Functionally compatible with the 74 series 245
Ordering Code:
Order Number Package Number
Package Description
74LVX3245WM
M24B
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
74LVX3245QSC
MQA24
24-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150” Wide
74LVX3245MTC
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 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 DS011620
www.fairchildsemi.com
1 page  
Capacitance
Symbol
CIN Input Capacitance
CI/O Input/Output
Capacitance
CPD Power Dissipation
Capacitance (Note 9)
Note 9: CPD is measured at 10 MHz
Parameter
A→B
B→A
Typ
4.5
15
55
40
8-Bit Dual Supply Translating Transceiver
The LVX3245 is a dual supply device capable of bidirec-
tional signal translation. This level shifting ability provides
an efficient interface between low voltage CPU local bus
with memory and a standard bus defined by 5V I/O levels.
The device control inputs can be controlled by either the
low voltage CPU and core logic or a bus arbitrator with 5V
I/O levels.
Manufactured on a sub-micron CMOS process, the
LVX3245 is ideal for mixed voltage applications such as
notebook computers using 3.3V CPU’s and 5V peripheral
devices.
Units
pF
pF
pF
Conditions
VCC = Open
VCCA = 3.3V
VCCB = 5.0V
VCCB = 5.0V
VCCA = 3.3V
Power Up Considerations
To insure that the system does not experience unneces-
sary ICC current draw, bus contention, or oscillations during
power up, the following guidelines should be adhered to
(refer to Table 1):
• Power up the control side of the device first. This is the
VCCA.
• OE should ramp with or ahead of VCCA. This will help
guard against bus contention.
• The Transmit/Receive control pin (T/R) should ramp with
VCCA, this will ensure that the A Port data pins are con-
figured as inputs. With VCCA receiving power first, the A
I/O Port should be configured as inputs to help guard
against bus contention and oscillations.
• A side data inputs should be driven to a valid logic level.
This will prevent excessive current draw.
The above steps will ensure that no bus contention or oscil-
lations, and therefore no excessive current draw occurs
during the power up cycling of these devices. These steps
will help prevent possible damage to the translator devices
and potential damage to other system components.
TABLE 1. Low Voltage Translator Power Up Sequencing Table
Device Type
VCCA
VCCB
T/R
OE
A Side I/O
B Side I/O
Floatable Pin
Allowed
74LVX3245
3V
(power up 1st)
5V
configurable
ramp
with VCCA
ramp
with VCCA
logic
0V or VCCA
outputs
No
Please reference Application Note AN-5001 for more detailed information on using Fairchild’s LVX Low Voltage Dual
Supply CMOS Translating Transceivers.
5 www.fairchildsemi.com
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet 6501.PDF ] | |
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