参数资料
型号: LTC2856CMS8-2#TRPBF
厂商: Linear Technology
文件页数: 15/20页
文件大小: 0K
描述: IC TXRX RS485/RS422 8-MSOP
标准包装: 2,500
类型: 收发器
驱动器/接收器数: 1/1
规程: RS422,RS485
电源电压: 4.5 V ~ 5.5 V
安装类型: 表面贴装
封装/外壳: 8-TSSOP,8-MSOP(0.118",3.00mm 宽)
供应商设备封装: 8-MSOP
包装: 带卷 (TR)
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
4
285678ff
For more information www.linear.com/LTC2856-1
elecTrical characTerisTics
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Driver
|VOD|
Differential Driver Output Voltage
R = ∞, VCC = 4.5V (Figure 1)
l
VCC
V
R = 27
Ω (RS485), VCC = 4.5V (Figure 1)
l
1.5
VCC
V
R = 50
Ω (RS422), VCC = 4.5V (Figure 1)
l
2
VCC
V
Δ|VOD|
Change in Magnitude of Driver Differential
Output Voltage for Complementary Output
States
R = 27
Ω or R = 50Ω (Figure 1)
l
0.2
V
VOC
Driver Common Mode Output Voltage
R = 27
Ω or R = 50Ω (Figure 1)
l
3
V
Δ|VOC|
Change in Magnitude of Driver Common Mode
Output Voltage for Complementary Output
States
R = 27
Ω or R = 50Ω (Figure 1)
l
0.2
V
IOZD
Driver Three-State (High Impedance) Output
Current on Y and Z
DE = 0V, (Y or Z) = –7V, 12V, LTC2858-1,
LTC2858-2
l
±10
A
IOSD
Maximum Driver Short-Circuit Current
–7V ≤ (Y or Z) ≤ 12V (Figure 2)
l
±120
±250
mA
Receiver
IIN
Receiver Input Current (A, B)
DE = TE = 0V, VCC = 0V or 5V, VIN = 12V
(Figure 3) (C, I-Grade)
DE = TE = 0V, VCC = 0V or 5V, VIN = –7V,
(Figure 3) (C, I-Grade)
l
–100
125
A
DE = TE = 0V, VCC = 0V or 5V, VIN = 12V
(Figure 3) (H-Grade)
DE = TE = 0V, VCC = 0V or 5V, VIN = –7V,
(Figure 3) (H-Grade)
l
–145
250
A
RIN
Receiver Input Resistance
RE = VCC or 0V, DE = TE = 0V,
VIN = –7V, –3V, 3V, 7V, 12V (Figure 3)
(C, I-Grade)
l
96
125
k
Ω
RE = VCC or 0V, DE = TE = 0V,
VIN = –7V, –3V, 3V, 7V, 12V (Figure 3)
(H-Grade)
l
48
125
k
Ω
VTH
Receiver Differential Input Threshold Voltage
–7V ≤ B ≤ 12V
l
±0.2
V
ΔVTH
Receiver Input Hysteresis
B = 0V
25
mV
VOH
Receiver Output High Voltage
I(RO) = –4mA, A-B = 200mV, VCC = 4.5V
l
2.4
V
VOL
Receiver Output Low Voltage
I(RO) = 4mA, A-B = –200mV, VCC = 4.5V
l
0.4
V
IOZR
Receiver Three-State (High Impedance) Output
Current on RO
RE = 5V, 0V ≤ RO ≤ VCC, LTC2856-1,
LTC2856-2, LTC2858-1, LTC2858-2
l
±1
A
Logic
VIH
Logic Input High Voltage
DE, DI, RE, VCC = 5.5V
l
2
V
VIL
Logic Input Low Voltage
DE, DI, RE, VCC = 4.5V
l
0.8
V
IINL
Logic Input Current
DE, DI, RE
l
0
±10
A
Supplies
ICCS
Supply Current in Shutdown Mode
DE = 0V, RE = VCC,
LTC2856, LTC2858 (C and I-Grade)
LTC2856, LTC2858 (H-Grade)
l
0
5
15
A
ICCR
Supply Current in Receive Mode
No Load, DE = 0V, RE = 0V, LTC2856-1,
LTC2856-2, LTC2858-1, LTC2858-2
l
540
900
A
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V unless otherwise noted. (Note 2)
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