ltc1545cg-trpbf Linear Technology Corporation, ltc1545cg-trpbf Datasheet - Page 6

• Manufacturer Part Number: ltc1545cg-trpbf
• Description: Software-selectable Multiprotocol Transceiver
• Manufacturer: Linear Technology Corporation

W
LTC1545
LTC1545 MODE NAME
Not Used (Default V.11)
RS530A
RS530
X.21
V.35
RS449/V.36
V.28/RS232
D4ENB = 1, R4EN = 0
M0 = M1 = M2 = 1
Note 1: Driver 3 and Receiver 1 are enabled (and disabled) by
DCE/DTE (Pin 14). Logic high enables Driver 3. Logic low enables
Receiver 1.
SWITCHI G TI E WAVEFOR S
6
TEST CIRCUITS
ODE SELECTIO
B – A
Figure 3. V.10/V.28 Driver Test Circuit
D
–V
5V
0V
V
O
O
A
B
U
D
V
O
A
W
M2
0
0
0
0
1
1
1
1
U
C
1.5V
L
t
PLH
50%
M1
0
1
1
0
1
0
0
1
R
t
r
L
1545 F03
t
10%
90%
SKEW
M0
0
1
0
1
0
1
0
1
Figure 5. V.11 Driver Propagation Delays
1/2 V
V.11
V.11
V.11
V.11
V.28
V.11
V.28
f = 1MHz : t
W
D1
Z
O
V
DIFF
V.11
V.10
V.11
V.11
V.28
V.11
V.28
r
= V(B) – V(A)
D2
Z
10ns : t
(Note 1) (Note 2)
f
Note 2: Driver 4 is enabled by D4ENB = 0 (Pin 15).
Note 3: Receiver 4 is enabled by R4EN = 1 (Pin 16).
V.11
V.11
V.11
V.11
V.28
V.11
V.28
D3
Z
10ns
V.10
V.10
V.10
V.10
V.28
V.10
V.28
D4
Z
Figure 4. V.10/V.28 Receiver Test Circuit
V.10
V.28
V.10
V.10
V.10
V.10
V.28
D5
Z
D
(Note 1)
V.11
V.11
V.11
V.11
V.28
V.11
V.28
R1
1.5V
Z
90%
t
A
PHL
V.11
V.10
V.11
V.11
V.28
V.11
V.28
A
R2
t
Z
f
50%
t
SKEW
R
10%
V.11
V.11
V.11
V.11
V.28
V.11
V.28
R3
Z
15pF
1545 F04
(Note 3)
V.10
V.10
V.10
V.10
V.28
V.10
V.28
R4
Z
1545 F05
V.10
V.10
V.10
V.10
V.28
V.10
V.28
R5
Z