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부품번호 | 74LCXH2245 기능 |
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기능 | Low Voltage Bidirectional Transceiver with Bushold and 26 Series Resistors in B Outputs | ||
제조업체 | Fairchild Semiconductor | ||
로고 | |||
전체 11 페이지수
October 2000
Revised September 2001
74LCXH2245
Low Voltage Bidirectional Transceiver with Bushold
and 26Ω Series Resistors in B Outputs
General Description
The LCXH2245 contains eight non-inverting bidirectional
buffers with 3-STATE outputs and is intended for bus ori-
ented applications. The device is designed for low voltage
(2.5V and 3.3V) VCC applications. The T/R input deter-
mines the direction of data flow through the device. The OE
input disables both the A and B ports by placing them in a
high impedance state. The 26Ω series resistor in the B Port
output helps reduce output overshoot and undershoot.
The LCXH2245 is fabricated with an advanced CMOS
technology to achieve high speed operation while maintain-
ing CMOS low power dissipation.
The LCXH2245 data inputs include active bushold circuitry,
eliminating the need for external pull-up resistors to hold
unused or floating data inputs at a valid logic level.
Features
s 5V tolerant control inputs
s 2.3V–3.6V VCC specifications provided
s Bushold on inputs eliminates the need for external
pull-up/pull-down resistors
s 7.0 ns tPD max (VCC = 3.3V), 10 µA ICC max
s Power down high impedance outputs
s ±12 mA output drive B Port (VCC = 3.0V)
s Implements patented noise/EMI reduction circuitry
s Latch-up performance exceeds 500 mA
s Equivalent 26Ω series resistor on B Port outputs
s ESD performance:
Human body model > 2000V
Machine model > 200V
Ordering Code:
Order Number Package Number
Package Description
74LCXH2245WM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74LCXH2245SJ
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74LCXH2245MSA
MSA20
20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
74LCXH2245MTC
MTC20
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Devices also available in Tape and Reel. Specify by appending the 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 (Bushold)
Side B Inputs or 3-STATE Outputs (Bushold)
GTO is a trademark of Fairchild Semiconductor Corporation.
© 2001 Fairchild Semiconductor Corporation DS500409
www.fairchildsemi.com
DC Electrical Characteristics (Continued)
Symbol
Parameter
Conditions
VCC
(V)
VOL LOW Level Output Voltage
A Outputs
VOL LOW Level Output Voltage
B Outputs
II
II(HOLD)
Input Leakage Current
Bushold Input Minimum
Drive Hold Current
II(OD)
Bushold Input Over-Drive
Current to Change State
IOL = 100 µA
IOL = 8 mA
IOL = 12 mA
IOL = 16 mA
IOL = 24 mA
IOL = 100 µA
IOL = 4 mA
IOL = 4 mA
IOL = 6 mA
IOL = 8 mA
IOL = 12 mA
VI = VCC or GND
VIN = 0.7V
VIN = 1.7V
VIN = 0.8V
VIN = 2.0V
(Note 5)
(Note 6)
2.3 − 3.6
2.3
2.7
3.0
3.0
2.3 − 3.6
2.3
2.7
3.0
2.7
3.0
2.3 − 3.6
2.3
3.0
2.7
(Note 5)
(Note 6)
3.6
IOZ 3-STATE I/O Leakage
ICC Quiescent Supply Current
∆ICC
Increase in ICC per Input
Note 4: Outputs disabled or 3-STATE only.
VO = VCC or GND
VI = VIH or VIL
VI = VCC or GND
3.6V ≤ VI, VO ≤ 5.5V (Note 4)
VIH = VCC −0.6V
2.3 − 3.6
2.3 − 3.6
2.3 − 3.6
2.3 - 3.6
Note 5: An external driver must source at least the specified current to switch from LOW-to-HIGH.
Note 6: An external driver must sink at least the specified current to switch from HIGH-to-LOW.
TA = −40°C to +85°C
Min Max
0.2
0.6
0.4
0.4
0.55
0.2
0.6
0.4
0.55
0.6
0.8
±5.0
45
−45
75
−75
300
−300
450
−450
±5.0
10
±10
500
Units
V
V
µA
µA
µA
µA
µA
µA
AC Electrical Characteristics
TA = −40°C to +85°C, RL = 500Ω
Symbol
Parameter
VCC = 3.3V ± 0.3V
CL = 50 pF
VCC = 2.7V
CL = 50 pF
VCC = 2.5V ± 0.2V
CL = 30 pF
Units
Min Max Min Max Min Max
tPHL Propagation Delay
tPLH A to B
1.5 8.0 1.5 9.0 1.5 9.6
ns
tPHL Propagation Delay
tPLH B to A
1.5 7.0 1.5 8.0 1.5 8.4
ns
tPZL
tPZH
Output Enable Time
A to B
1.5 9.5 1.5 10.5 1.5 11.0 ns
tPZL
tPZH
Output Enable Time
B to A
1.5 8.5 1.5 9.5 1.5 10.5 ns
tPLZ
tPHZ
Output Disable Time
A to B
1.5 7.5 1.5 8.5 1.5 9.0
ns
tPLZ
tPHZ
Output Disable Time
B to A
1.5 7.5 1.5 8.5 1.5 9.0
ns
tOSHL
tOSLH
Output to Output Skew
(Note 7)
1.0
ns
Note 7: 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).
www.fairchildsemi.com
4
4페이지 Schematic Diagram Generic for LCXH Family (with Bushold)
7 www.fairchildsemi.com
7페이지 | |||
구 성 | 총 11 페이지수 | ||
다운로드 | [ 74LCXH2245.PDF 데이터시트 ] |
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부품번호 | 상세설명 및 기능 | 제조사 |
74LCXH2245 | Low Voltage Bidirectional Transceiver with Bushold and 26 Series Resistors in B Outputs | Fairchild Semiconductor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |