Fairchild Semiconductor 74LVT2245WMX, 74LVT2245WM, 74LVT2245SJX, 74LVT2245SJ, 74LVT2245MTCX Datasheet
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© 2000 Fairchild Semiconductor Corporation DS012173 www.fairchildsemi.com
November 1999
Revised January 2000
74LVT2245 • 74LVTH2245 Low Voltage Octal Bidirectional Transceiver with 3-STATE Inputs/Outputs and 25Ω
Series Resistors in the B Port Outputs
74LVT2245 • 74LVTH2245
Low Voltage Octal Bidirectional Transceiver with
3-STATE Inputs/Outputs and 25Ω Series Resisto rs
in the B Port Outputs
General Description
The LVT2245 and LVTH2245 contain eight non-inverting
bidirectional buffers with 3-STATE outputs and are
intended for bus-oriented applications. The Transmit/
Receive (T/R
) input determines the di rection of data flow
through the bidirectional transceiver. Transmit (activeHIGH) enables data from A Ports to B Ports; Receive
(active-LOW) enabl es data from B Ports to A Por ts. The
Output Enable input, when H IGH, disables both A and B
Ports by placing them in a high impedance state. The
equivalent 25Ω-serie s resistor in the B Port helps reduce
output overshoot and undershoot.
The LVTH2245 data inputs include bushold, eliminating the
need for external pull-up resistors to hold unused inputs.
These transceivers are designed for low voltage (3.3V)
V
CC
applications, bu t with the capabi lity to provide a TTL
interface to a 5V environment. The LVT2245 and
LVTH2245 are fabricated with an adv anced Bi CMO S technology to achieve high speed o peration si milar to 5V A BT
while maintaining low power dissipation.
Features
■ Input and output interface capability to systems at
5V V
CC
■ Equivalent 25Ω series resistor on B Port outputs
■ Bushold data inputs el iminate th e need fo r exter nal pul l-
up resistors to hold unused in puts (74LVTH2245), also
available without bushold feature (74LVT2245)
■ Live insertion/extraction permitted
■ Power Up/Down high impedance provides glitch-free
bus loading
■ Outputs source/sink −12 mA/+12 mA on B Port,
−32 mA/+64 mA on A Port
■ Latch-up performance exceeds 500 mA
Ordering Code:
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Order Number Package Number Package Description
74LVT2245WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
74LVT2245SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II 5.3mm Wide
74LVT2245MSA MSA20 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
74LVT2245MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74LVTH2245WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
74LVTH2245SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II 5.3mm Wide
74LVTH2245MSA MSA20 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
74LVTH2245MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
www.fairchildsemi.com 2
74LVT2245 • 74LV TH22 45
Logic Symbols
IEEE/IEC
Connection Diagram
Pin Descriptions
Truth Table
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Pin Names Description
OE
Output Enable Input
T/R
Transmit/Receive Input
A
0–A7
Side A Inputs or 3-STATE Outputs
B
0–B7
Side B Inputs or 3-STATE Outputs
Inputs
Outputs
OE
T/R
L L Bus B Data to Bus A
L H Bus A Data to Bus B
HXHIGH-Z State
3 www.fairchildsemi.com
74LVT2245 • 74LVTH2245
Absolute Maximum Ratings (Note 1)
Recommended Operating Conditions
Note 1: Absolute Maximum continuous ratings are those v alues beyond whic h damage to the device may occur. Exposure to these conditions or conditions
beyond those indicated may adversely affect device reliability. Functional operation under absolute maximum rated conditions is not implied.
Note 2: I
O
Absolute Maximum Rating must be observed.
Symbol Parameter Value Condition s Units
V
CC
Supply Voltage −0.5 to +4.6 V
V
I
DC Input Voltage −0.5 to +7.0 V
V
O
Output Voltage −0.5 to +7.0 Output in 3-STATE
V
−0.5 to +7.0 Output in HIGH or LOW State (Note 2)
I
IK
DC Input Diode Current −50 VI < GND mA
I
OK
DC Output Diode Current −50 VO < GND mA
I
O
DC Output Current 64 VO > VCCOutput at HIGH State
mA
128 V
O
> VCCOutput at LOW State
I
CC
DC Supply Current per Supply Pin ±64 mA
I
GND
DC Ground Current per Ground Pin ±128 mA
T
STG
Storage Temperature −65 to +150 °C
Symbol Parameter Min Max Units
V
CC
Supply Voltage 2.7 3.6 V
V
I
Input Voltage 0 5.5 V
I
OH
HIGH-Level Output Current A Port −32
mA
B Port −12
I
OL
LOW-Level Output Current A Port 64
mA
B Port 12
T
A
Free Air Operating Temperature −40 +85 °C
∆t/∆V Input Edge Rate, V
IN
= 0.8V–2.0V, VCC = 3.0V 0 10 ns/V
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