MAX14770E_13 Datasheet, PDF (8/16 Pages) Maxim Integrated Products – High-ESD Profibus RS-485 Transceiver

MAX14770E
High-ESD Profibus RS-485 Transceiver
ATE
V_ID
A
R ^RECEIVER
OUTPUT
B
Figure 8. Receiver Propagation Delay Test Circuit
A
B
VOH
RO
VOL
Figure 9. Receiver Propagation Delays
t = 1MHz, t_LH P 3ns, t_HL P 3ns
t_RPHL
t_RPLH
VCC
VCC
2
2
t_{RSKEW =} |t_RPHL - t_RPLH|
+1.5V
S3
R
S1
-1.5V
1kI
VCC
VID R ^RO
S2
CL
15pF
RE
GENERATOR
50I
RE
RO
RE
1.5V
tRHZ
RO
0.25V
VCC
1.5V
tRZH, tRZH (SHDN) ⁰
S1 OPEN
S2 CLOSED
S3 = +1.5V
VOH
VCC
2
0
VCC _{S1 OPEN}
S2 CLOSED
S3 = +1.5V
0
VOH
0
Figure 10. Receiver Enable and Disable Times
8  
RE
tRZL, tRZL(SHDN)
RO
1.5V
RE
tRLZ
RO
0.25V
1V
-1V
VCC
S1 CLOSED
1.5V
S2 OPEN
0 ^{S3 = -1.5V}
VCC
VCC
2
VOL
VCC _{S1 CLOSED}
S2 OPEN
S3 = -1.5V
0
VCC
VOL
Maxim Integrated