MC74LVX4245DTR2G ON Semiconductor, MC74LVX4245DTR2G Datasheet - Page 6

• Manufacturer Part Number: MC74LVX4245DTR2G
• Description: IC TXRX DUAL OCT 3ST LV 24TSSOP
• Manufacturer: ON Semiconductor
• Series: LVXr
• Type: Transceiverr

Specifications of MC74LVX4245DTR2G

• Number Of Drivers/receivers: 8/8
• Voltage - Supply: 2.7 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Logic Family: LVX
• Operating Supply Voltage (typ): 3.3/5V
• Propagation Delay Time: 11.5ns
• Number Of Elements: 1
• Number Of Channels: 8
• Input Logic Level: CMOS
• Output Logic Level: CMOS
• Output Type: 3-State
• Package Type: TSSOP
• Polarity: Non-Inverting
• Operating Supply Voltage (min): 2.7/4.5V
• Technology: CMOS
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Additional Features: W/Volt Translation
• Pin Count: 24
• Output Current: 24mA
• Logic Type: Transceiver, Translating
• Supply Voltage Range: 2.7V To 3.6V
• Logic Case Style: TSSOP
• No. Of Pins: 24
• Operating Temperature Range: -40°C To +85°C
• Family Type: LVX
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Protocol: -
• Lead Free Status / Rohs Status: Compliant
• Other names: MC74LVX4245DTR2GOS; MC74LVX4245DTR2GOS; MC74LVX4245DTR2GOSTR

Dual Supply Octal Translating Transceiver
of bidirectional signal voltage translation. This level shifting
ability provides an excellent interface between low voltage
CPU local bus and a standard 5.0 V I/O bus. The device
control inputs can be controlled by either the low voltage
CPU and core logic or a bus arbitrator with 5.0 V I/O levels.
as notebook computers using a 3.3 V CPU and 5.0 V
peripheral devices.
Applications:
Mixed Mode Dual Supply Interface Solutions
when CMOS devices cannot tolerate I/O levels above their
applied V
V device, the P−Channel transistor in the 3.0 V device will
conduct − causing current flow from the I/O bus to the 3.0 V
power supply. The result may be destruction of the 3.0 V
device through latchup effects. A current limiting resistor
may be used to prevent destruction, but it causes speed
degradation and needless power dissipation.
two different output levels that easily handle the dual voltage
interface. The A port is a dedicated 5.0 V port; the B port is
a dedicated 3.0 V port.
either use it for bidirectional or unidirectional applications.
The center 20 pins are configured to match a ‘245 pinout.
This enables the user to easily replace this level shifter with
a 3.0 V ‘245 device without additional layout work or re−
manufacture of the circuit board (when both buses are 3.0 V).
The 74LVX4245 is a is a dual−supply device well capable
The LVX4245 is ideal for mixed voltage applications such
The LVX4245 is designed to solve 3.0 V / 5.0 V interfaces
A better solution is provided in the LVX4245. It provides
Since the LVX4245 is a ‘245 transceiver, the user may
CC
. If an I/O pin of a 3.0 V device is driven by a 5.0
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MC74LVX4245
6
Powering Up the LVX4245
V
several milliamps of either I
If the V
then only nanoamps of Icc current will result. In actuality the
V
the current penalty, but this “setup time” is dependent on the
power−up ramp rate of the V
approximately 50 mV/ns (50V/ms) a 25 ns setup time was
observed (V
setup time was about 140ns. When all is said and done, the
safest powerup strategy is to simply power V
V
the V
even if the V
CCB
CCB
CCB
When powering up the LVX4245, please note that if the
CCA
. One more note: if the V
pin is powered−up well in advance of the V
can be powered “slightly” before the V
Figure 3. 3.3V/5V Interface Block Diagram
CCA
ramp rate then power problems might still occur,
CCA
pin is powered−up in advance of the V
CCB
V
V
CCB
CCA
powerup began prior to the V
LOW VOLTAGE CPU LOCAL BUS
LVX4245
before V
EISA − ISA − MCA
(5V I/O LEVELS)
CCA
CCA
CC
). With a 7.0 V/ms rate, the
CCB
V
V
or I
pins. With a ramp rate of
CCB
CCA
ramp rate is faster than
LVX4245
CCB
current will result.
CCB
CCA
CCA
powerup.
CCA
CCB
without
before
pin,
pin