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PDF 74LVT2245MTC Data sheet ( Hoja de datos )
| Número de pieza | 74LVT2245MTC | |
| Descripción | Low Voltage Octal Bidirectional Transceiver with 3-STATE Inputs/Outputs and 25 Series Resistors in the B Port Outputs | |
| Fabricantes | Fairchild Semiconductor | |
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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
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 direction of data flow
through the bidirectional transceiver. 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 state. The
equivalent 25Ω-series 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)
VCC applications, but with the capability to provide a TTL
interface to a 5V environment. The LVT2245 and
LVTH2245 are fabricated with an advanced BiCMOS tech-
nology to achieve high speed operation similar to 5V ABT
while maintaining low power dissipation.
Features
s Input and output interface capability to systems at
5V VCC
s Equivalent 25Ω series resistor on B Port outputs
s Bushold data inputs eliminate the need for external pull-
up resistors to hold unused inputs (74LVTH2245), also
available without bushold feature (74LVT2245)
s Live insertion/extraction permitted
s Power Up/Down high impedance provides glitch-free
bus loading
s Outputs source/sink −12 mA/+12 mA on B Port,
−32 mA/+64 mA on A Port
s Latch-up performance exceeds 500 mA
Ordering Code:
Order Number Package Number
Package Description
74LVT2245WM
74LVT2245SJ
M20B
M20D
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
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
74LVTH2245MTC
MSA20
MTC20
20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
© 2000 Fairchild Semiconductor Corporation DS012173
www.fairchildsemi.com
1 page  
AC Electrical Characteristics
TA = −40°C to +85°C
Symbol
Parameter
CL = 50 pF, RL = 500Ω
VCC = 3.3V ± 0.3V
VCC = 2.7V
Units
Min Max Min Max
tPLH Propagation Delay Data to B Port Output
tPHL
1.2 4.4 1.2 5.1
ns
1.2 4.4 1.2 5.1
tPLH Propagation Delay Data to A Port Output
tPHL
1.2 3.6 1.2 4.0
ns
1.2 3.5 1.2 4.0
tPZH Output Enable Time for B Port Output
tPZL
1.3 6.2 1.3 7.3
ns
1.7 6.2 1.7 7.3
tPZH Output Enable Time for A Port Output
tPZL
1.3 5.5 1.3 7.1
ns
1.7 5.7 1.7 6.7
tPHZ Output Disable Time for B Port Output
tPLZ
2.0 5.9 2.0 6.5
ns
2.0 5.4 2.0 5.7
tPHZ Output Disable Time for A Port Output
tPLZ
2.0 5.9 2.0 6.5
ns
2.0 5.0 2.0 5.1
tOSHL
tOSLH
A Port Output to Output Skew
(Note 9)
1.0 1.0 ns
tOSHL
tOSLH
B Port Output to Output Skew
(Note 9)
1.0 1.0 ns
Note 9: 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).
Capacitance (Note 10)
Symbol
Parameter
Conditions
CIN Input Capacitance
VCC = 0V, VI = 0V or VCC
CI/O
Input/Output Capacitance
VCC = 3.0V, VO = 0V or VCC
Note 10: Capacitance is measured at frequency f = 1 MHz, per MIL-STD-883, Method 3012.
Typical
4
8
Units
pF
pF
5 www.fairchildsemi.com
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| PDF Descargar | [ Datasheet 74LVT2245MTC.PDF ] | |
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