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부품번호 | 74LVT2245 기능 |
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기능 | Low Voltage Octal Bidirectional Transceiver with 3-STATE Inputs/Outputs and 25 Series Resistors in the B Port Outputs | ||
제조업체 | Fairchild Semiconductor | ||
로고 | |||
전체 9 페이지수
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
DC Electrical Characteristics
Symbol
Parameter
VCC
TA = −40°C to +85°C
Units
(V) Min Max
Conditions
VIK Input Clamp Diode Voltage
VIH Input HIGH Voltage
VIL Input LOW Voltage
VOH
Output HIGH Voltage
A Port
B Port
VOL
Output LOW Voltage
A Port
II(HOLD)
(Note 3)
II(OD)
(Note 3)
B Port
Bushold Input Minimum Drive
Bushold Input Over-Drive
Current to Change State
2.7
2.7–3.6
2.7–3.6
2.7
3.0
3.0
2.7–3.6
2.7
3.0
3.0
3.0
3.0
2.7
3.0
3.0
2.0
2.4
2.0
2.0
VCC−0.2
75
−75
500
−500
−1.2
0.8
0.5
0.4
0.5
0.55
0.8
0.2
V II = −18 mA
V VO ≤ 0.1V or
V VO ≥ VCC − 0.1V
V IOH = −8 mA
IOH = −32 mA
V IOH = −12 mA
V IOH = −100 µA
IOL = 24 mA
V IOL = 16 mA
IOL = 32 mA
IOL = 64 mA
V IOL = 12 mA
V IOL = 100 µA
µA VI = 0.8V
VI = 2.0V
(Note 4)
µA
(Note 5)
II Input Current
Control Pins
Data Pins
3.6
3.6
3.6
IOFF
IPU/PD
Power Off Leakage Current
Power Up/Down
3-STATE Current
IOZL 3-STATE Output Leakage Current
IOZL (Note 3) 3-STATE Output Leakage Current
IOZH 3-STATE Output Leakage Current
IOZH (Note 3) 3-STATE Output Leakage Current
IOZH+
3-STATE Output Leakage Current
ICCH
Power Supply Current
ICCL Power Supply Current
ICCZ Power Supply Current
ICCZ+
Power Supply Current
0
0–1.5V
3.6
3.6
3.6
3.6
3.6
3.6
3.6
3.6
3.6
10
±1
−5
1
±100
±100
−5
−5
5
5
10
0.19
5
0.19
0.19
VI = 5.5V
µA VI = 0V or VCC
VI = 0V
VI = VCC
µA 0V ≤ VI or VO ≤ 5.5V
µA VO = 0.5V to 3.0V
VI = GND or VCC
µA VO = 0.5V
µA VO = 0.0V
µA VO = 3.0V
µA VO = 3.6V
µA VCC < VO ≤ 5.5V
mA Outputs High
mA Outputs Low
mA Outputs Disabled
mA VCC ≤ VO ≤ 5.5V,
Outputs Disabled
∆ICC
Increase in Power Supply Current
(Note 6)
Note 3: Applies to Bushold versions only (74LVTH2245).
3.6
0.2 mA One Input at VCC − 0.6V
Other Inputs at VCC or GND
Note 4: An external driver must source at least the specified current to switch from LOW-to-HIGH.
Note 5: An external driver must sink at least the specified current to switch from HIGH-to-LOW.
Note 6: This is the increase in supply current for each input that is at the specified voltage level rather than VCC or GND.
Dynamic Switching Characteristics (Note 7)
Symbol
Parameter
VCC TA = 25°C
(V) Min Typ Max
VOLP
VOLV
Quiet Output Maximum Dynamic VOL
Quiet Output Minimum Dynamic VOL
3.3
3.3
0.8
−0.8
Note 7: Characterized in SOIC package. Guaranteed parameter, but not tested.
Note 8: Max number of outputs defined as (n). n−1 data inputs are driven 0V to 3V. Output under test held LOW.
Units
V
V
Conditions
CL = 50 pF,
RL = 500Ω
(Note 8)
(Note 8)
www.fairchildsemi.com
4
4페이지 Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Small Outline Package (SOP), EIAJ TYPE II 5.3mm Wide
Package Number M20D
7 www.fairchildsemi.com
7페이지 | |||
구 성 | 총 9 페이지수 | ||
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