SPECIFICATIONS (continued)
TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted.
PARAMETERS
MIN.
TYP.
MAX. UNITS
CONDITIONS
SP491E RECEIVER
DC Characteristics
Differential Input Threshold
Input Hysteresis
Output Voltage HIGH
Output Voltage LOW
Three State (high impedance)
Output Current
-0.2
3.5
+0.2 Volts
mV
-7V ≤ VCM ≤ 12V
VCM = 0V
IO = -4mA, VID = +200mV
IO = +4mA, VID = -200mV
70
Volts
0.4
Volts
±1
µA
kΩ
0.4V ≤ VO ≤ 2.4V; REB = 5V
-7V ≤ VCM ≤ 12V
Input Resistance
12
15
Input Current (A, B); VIN = 12V
Input Current (A, B); VIN = -7V
Short-Circuit Current
±1.0 mA
DE = 0V, VCC = 0V or 5.25V, VIN = 12V
DE = 0V, VCC = 0V or 5.25V, VIN = -7V
0V ≤ VO ≤ VCC
-0.8
85
mA
mA
SP491E RECEIVER
AC Characteristics
Maximum Data Rate
Receiver Input to Output
10
20
Mbps
ns
REB = 0V, DE = 5V
tPLH; RDIFF = 54Ω,
45
45
13
100
100
CL1 = CL2 = 100pF; Figures 3 & 7
tPHL; RDIFF = 54Ω,
Receiver Input to Output
20
ns
ns
CL1 = CL2 = 100pF; Figures 3 & 7
RDIFF = 54Ω; CL1 = CL2 = 100pF;
Figures 3 & 7
Diff. Receiver Skew ItPLH-tPHL
I
Receiver Enable to Output LOW
Receiver Enable to Output HIGH
Receiver Disable from LOW
Receiver Disable from HIGH
45
45
45
45
70
70
70
70
ns
ns
ns
ns
CRL = 15pF; Figures 2 and 8; S1 closed
CRL = 15pF; Figures 2 and 8; S2 closed
CRL = 15pF; Figures 2 and 8; S1 closed
CRL = 15pF; Figures 2 and 8; S2 closed
POWER REQUIREMENTS
Supply Voltage
+4.75
+5.25 Volts
Supply Current
900
µA
REB, D = 0V or VCC; DE = VCC
SP491E ENVIRONMENTAL
AND MECHANICAL
Operating Temperature
Commercial (_C_)
Industrial (_E_)
Storage Temperature
Package
0
-40
-65
+70
+85
+150 °C
°C
°C
Plastic DIP (_P)
NSOIC (_N)
+3V
RE
0V
1.5V
1.5V
f = 1MHz; t < 10ns; t < 10ns
R
F
t
t
LZ
ZL
5V
R
1.5V
Output normally LOW
Output normally HIGH
0.5V
0.5V
V
IL
V
IH
R
1.5V
0V
t
t
HZ
ZH
Figure 8. Receiver Enable and Disable Times
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
© Copyright 2000 Sipex Corporation
6
SIPEX [ SIPEX CORPORATION ]
