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参数资料
型号： LTC1387CG#TRPBF
厂商： Linear Technology
文件页数： 7/12页
文件大小： 0K
描述： IC TXRX RS232/RS485 5VSNGL20SSOP
标准包装： 1,800
类型： 收发器
驱动器/接收器数： 2/2
规程： RS232，RS485
电源电压： 5V
安装类型： 表面贴装
封装/外壳： 20-SSOP（0.209"，5.30mm 宽）
供应商设备封装： 20-SSOP
包装： 带卷 (TR)
4
LTC1387
AC ELECTRICAL CHARACTERISTICS
TA = 25°C, VCC = 5V, C1 = C2 = C3 = C4 = 0.1F (Notes 2, 3), unless otherwise noted.
The q denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to device ground unless
otherwise specified.
Note 3: All typicals are given at VCC = 5V, C1 = C2 = C3 = C4 = 0.1F
and TA = 25°C.
Note 4: Short-circuit current for RS485 driver output low state folds back
above VCC. Peak current occurs around VO = 3V.
Note 5: SLEW includes an internal pull-up in RS485 mode.
PIN FUNCTIONS
UU
U
C1+ (Pin 1): Commutating Capacitor C1 Positive Terminal.
Requires an external 0.1
F capacitor between Pins 1 and 2.
C1– (Pin 2): Commutating Capacitor C1 Negative Terminal.
VDD (Pin 3): Charge Pump Positive Supply Output.
Requires an external 0.1
F capacitor to ground.
A (Pin 4): Receiver Input A. Inverting input of RS232
receiver A in RS232 mode; inverting RS485 receiver input
in RS485 mode.
B (Pin 5): Receiver Input B. Inverting input of RS232
receiver B in RS232 mode; noninverting RS485 receiver
input in RS485 mode.
Y (Pin 6): Driver Output Y. Inverting RS232 driver Y output
in RS232 mode; inverting RS485 driver output in RS485
mode.
Z (Pin 7): Driver Output Z. Inverting RS232 driver Z output
in RS232 mode; noninverting RS485 driver output in
RS485 mode.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
RS485 Mode (Fast Slew Rate, ON = DXEN = High, 485/232 = High, SLEW = High)
tZL
Driver Enable to Output Low
Figures 3, 8, CL = 100pF, S1 Closed
q
50
90
ns
tZH
Driver Enable to Output High
Figures 3, 8, CL = 100pF, S2 Closed
q
50
90
ns
tLZ
Driver Disable from Low
Figures 3, 8, CL = 15pF, S1 Closed
q
50
90
ns
tHZ
Driver Disable from High
Figures 3, 8, CL = 15pF, S2 Closed
q
60
90
ns
RS485 Mode (Slow Slew Rate, ON = DXEN = High, 485/232 = High, SLEW = Low)
tPLH
Driver Input to Output
Figures 2, 7, RL = 54, CL = 100pF
q
100
700
1500
ns
tPHL
Driver Input to Output
Figures 2, 7, RL = 54, CL = 100pF
q
100
700
1500
ns
tSKEW
Driver Output to Output
Figures 2, 7, RL = 54, CL = 100pF
q
200
750
ns
tr, tf
Driver Rise or Fall Time
Figures 2, 7, RL = 54, CL = 100pF
q
150
300
1500
ns
tZL
Driver Enable to Output Low
Figures 3, 8, CL = 100pF, S1 Closed
q
600
1500
ns
tZH
Driver Enable to Output High
Figures 3, 8, CL = 100pF, S2 Closed
q
600
1500
ns
tLZ
Driver Disable from Low
Figures 3, 8, CL = 15pF, S1 Closed
q
100
200
ns
tHZ
Driver Disable from High
Figures 3, 8, CL = 15pF, S2 Closed
q
100
200
ns
RS485 Mode (ON = RXEN = High, 485/232 = High)
tPLH
Receiver Input to Output
Figures 2, 9, RL = 54, CL = 100pF
q
20
70
140
ns
tPHL
Receiver Input to Output
Figures 2, 9, RL = 54, CL = 100pF
q
20
70
140
ns
tSKEW
Differential Receiver Skew,
tPLH – tPHL
Figures 2, 9, RL = 54, CL = 100pF
10
ns
Receiver Output Enable/Disable (ON = High)
tZL
Receiver Enable to Output Low
Figures 6, 12, CL = 15pF, S1 Closed
q
40
90
ns
tZH
Receiver Enable to Output High
Figures 6, 12, CL = 15pF, S2 Closed
q
40
90
ns
tLZ
Receiver Disable from Low
Figures 6, 12, CL = 15pF, S1 Closed
q
40
90
ns
tHZ
Receiver Disable from High
Figures 6, 12, CL = 15pF, S2 Closed
q
40
90
ns
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