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参数资料
| 型号： | LTC491IS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS485 LOW POWER 14-SOIC |
| 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： | 4.75 V ~ 5.25 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOIC |
| 包装： | 带卷 (TR) |
3
LTC491
491fa
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
tPLH
Driver Input to Output
RDIFF = 54, CL1 = CL2 = 100pF
q
10
30
50
ns
tPHL
Driver Input to Output
q
10
30
50
ns
tSKEW
Driver Output to Output
q
5ns
tr, tf
Driver Rise or Fall Time
q
515
25
ns
tZH
Driver Enable to Output High
CL = 100pF (Figures 4, 6) S2 Closed
q
40
70
ns
tZL
Driver Enable to Output Low
CL = 100pF (Figures 4, 6) S1 Closed
q
40
70
ns
tLZ
Driver Disable Time From Low
CL = 15pF (Figures 4, 6) S1 Closed
q
40
70
ns
tHZ
Driver Disable Time From High
CL = 15pF (Figures 4, 6) S2 Closed
q
40
70
ns
tPLH
Receiver Input to Output
RDIFF = 54, CL1 = CL2 = 100pF
q
40
70
150
ns
tPHL
Receiver Input to Output
q
40
70
150
ns
tSKD
tPLH – tPHL Differential Receiver Skew
q
13
ns
tZL
Receiver Enable to Output Low
CL = 15pF (Figures 3, 8) S1 Closed
q
20
50
ns
tZH
Receiver Enable to Output High
CL = 15pF (Figures 3, 8) S2 Closed
q
20
50
ns
tLZ
Receiver Disable From Low
CL = 15pF (Figures 3, 8) S1 Closed
q
20
50
ns
tHZ
Receiver Disable From High
CL = 15pF (Figures 3, 8) S2 Closed
q
20
50
ns
S
U
GC
C
HARA TERISTICS
WITCHI
(Figures 2, 5)
(Figures 2, 7)
Note 3: All typicals are given for VCC = 5V and temperature = 25°C.
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.
NC (Pin 1): Not Connected.
R (Pin 2): Receiver Output. If the receiver output is enabled
(REB low), then if A > B by 200mV, R will be high. If A < B
by 200mV, then R will be low.
REB (Pin 3): Receiver Output Enable. A low enables the
receiver output, R. A high input forces the receiver output
into a high impedance state.
DE (Pin 4): Driver Output Enable. A high on DE enables the
driver outputs, Y and Z. A low input forces the driver
outputs into a high impedance state.
D (Pin 5): Driver Input. If the driver outputs are enabled
(DE high), then a low on D forces the driver outputs Y low
and Z high. A high on D will force Y high and Z low.
GND (Pin 6): Ground Connection.
GND (Pin 7): Ground Connection.
NC (Pin 8): Not Connected.
Y (Pin 9): Driver Output.
Z (Pin 10): Driver Output.
B (Pin 11): Receiver Input.
A (Pin 12): Receiver Input.
NC (Pin 13): Not Connected.
VCC (Pin 14): Positive Supply; 4.75V ≤ VCC ≤ 5.25V.
The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V ±5%
UU
U
PI FU CTIO S
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