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LTC2844IG#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
7
LTC2844
sn2844 2844fs
Figure 3. V.10/V.28 Driver Test Circuit
Figure 4. V.10/V.28 Receiver Test Circuit
A
D
2844 F04
C
L
R
A
A
D
2844 F03
R
L
C
L
TEST CIRCUITS
BLOCK DIAGRA
W
Figure 1. V.11 Driver Test Circuit
A
B
A
R
B
2844 F02
R
L
100Ω
C
L
100pF
C
L
100pF
C
L
A
B
2844 F01
V
OD
V
OC
R
L
R
L
Figure 2. V.11 Driver/Receiver AC Test Circuit
MODE
SELECTION
LOGIC
R2
R2A
R2B
R3
R3A
R3B
S3
20k
20k
20k
20k
S3
10k
6k
D3/R1 B
10k
10k
10k
D3
DCE/DTE
R1
D3
R1
6k
20k
20k
S3
10k
10k
2844 BD
6k
7
8
5
6
20
19
D2
D2A
D2B
D2
4
24
23
D1
D1A
D1B
D1
3
V
DD
2
V
CC
1
GND
27
V
EE
28
26
25
18
17
21
S3
20k
10k 6k
D4/R4 A
D4
R4
D4
9
10
M0
11
M1
12
M2
13
16
V
IN
1514
R2
R3
R4
D3/R1 A
25
8
LTC2844
sn2844 2844fs
ODE SELECTIO
W
U
(Note 2) (Note 2) (Note 2) (Note 2) (Note 3) (Note 3) (Note 3)
R1 R2 R3 R4A R1 R2 R4
ABABAB R3
V.11 V.11 V.11 V.11 V.11 V.11 30k CMOS CMOS Z
V.11 V.11 V.10 30k V.11 V.11 30k CMOS CMOS Z
V.11 V.11 V.11 V.11 V.11 V.11 30k CMOS CMOS Z
V.11 V.11 V.11 V.11 V.11 V.11 30k CMOS CMOS Z
V.28 30k V.28 30k V.28 30k 30k CMOS CMOS Z
V.11 V.11 V.11 V.11 V.11 V.11 30k CMOS CMOS Z
V.28 30k V.28 30k V.28 30k 30k CMOS CMOS Z
30k 30k 30k 30k 30k 30k 30k Z Z Z
30k 30k V.11 V.11 V.11 V.11 V.10 Z CMOS CMOS
30k 30k V.10 30k V.11 V.11 V.10 Z CMOS CMOS
30k 30k V.11 V.11 V.11 V.11 V.10 Z CMOS CMOS
30k 30k V.11 V.11 V.11 V.11 V.10 Z CMOS CMOS
30k 30k V.28 30k V.28 30k V.28 Z CMOS CMOS
30k 30k V.11 V.11 V.11 V.11 V.10 Z CMOS CMOS
30k 30k V.28 30k V.28 30k V.28 Z CMOS CMOS
30k 30k 30k 30k 30k 30k 30k Z Z Z
(Note 1) (Note 1) (Note 1)
MODE NAME M2 M1 M0 DCE D1 D3 D4 D1 D2 D3 D4A
/DTE D2 ABABAB
Not Used
(Default V.11) 0000TTLXTTLV.11V.11V.11V.11ZZV.10
RS530A 0010TTLXTTLV.11V.11V.10ZZZV.10
RS530 0100TTLXTTLV.11V.11V.11V.11ZZV.10
X.21 0110TTLXTTLV.11V.11V.11V.11ZZV.10
V.35 1000TTLXTTLV.28ZV.28ZZZV.28
RS449/V.36 1010TTLXTTLV.11V.11V.11V.11ZZV.10
V.28/RS232 1100TTLXTTLV.28ZV.28ZZZV.28
No Cable 1110XXXZZZZZZZ
Not Used
(Default V.11) 0001TTLTTLXV.11V.11V.11V.11V.11V.11Z
RS530A 0011TTLTTLXV.11V.11V.10ZV.11V.11Z
RS530 0101TTLTTLXV.11V.11V.11V.11V.11V.11Z
X.21 0111TTLTTLXV.11V.11V.11V.11V.11V.11Z
V.35 1001TTLTTLXV.28ZV.28ZV.28ZZ
RS449/V.36 1011TTLTTLXV.11V.11V.11V.11V.11V.11Z
V.28/RS232 1101TTLTTLXV.28ZV.28ZV.28ZZ
No Cable 1111XXXZZZZZZZ
MODE NAME M2 M1 M0 DCE
/DTE
Not Used
(Default V.11) 0 0 0 0
RS530A 0 0 1 0
RS530 0 1 0 0
X.21 0 1 1 0
V.35 1 0 0 0
RS449/V.36 1 0 1 0
V.28/RS232 1 1 0 0
No Cable 1 1 1 0
Not Used
(Default V.11) 0 0 0 1
RS530A 0 0 1 1
RS530 0 1 0 1
X.21 0 1 1 1
V.35 1 0 0 1
RS449/V.36 1 0 1 1
V.28/RS232 1 1 0 1
No Cable 1 1 1 1
Note 1: Driver inputs are TTL level compatible.
Note 2: Unused receiver inputs are terminated with 30k to ground.
Note 3: Receiver outputs are CMOS level compatible and have a weak pull-up to V
IN
when Z.
9
LTC2844
sn2844 2844fs
Figure 7. V.10, V.28 Driver Propagation Delays
Figure 6. V.11, V.35 Receiver Propagation Delays
Figure 8. V.10, V.28 Receiver Propagation Delays
3V
0V
1.5V
0V
–3V
3V
1.5V
0V
3V
–3V
t
PHL
t
f
V
O
–V
O
D
A
t
PLH
t
r
2844 F07
V
OD2
–V
OD2
0V
1.65V
0V
1.65V
t
PLH
V
OH
V
OL
B – A
R
t
PHL
2844 F06
f = 1MHz : t
r
≤ 10ns : t
f
≤ 10ns
INPUT
OUTPUT
V
IH
V
IL
RECEIVER THRESHOLD
1.65V
RECEIVER THRESHOLD
t
PHL
V
OH
V
OL
A
R
t
PLH
2844 F08
1.65V
3V
1.5V 1.5V
50%
10%
90%
t
PLH
t
r
0V
V
O
V
O
–V
O
D
B – A
A
B
t
PHL
t
SKEW
t
SKEW
2844 F05
1/2 V
O
f = 1MHz : t
r
≤ 10ns : t
f
≤ 10ns
V
DIFF
= V(A) – V(B)
50%
10%
90%
t
f
Figure 5. V.11, V.35 Driver Propagation Delays
SWITCHI G TI E WAVEFOR S
UWW
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC2844IG#TRPBF

Mfr. #:
Buy LTC2844IG#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
RS-232 Interface IC 3.3V Sftwr-Sel Multiprotocol Tran
Lifecycle:
New from this manufacturer.
Delivery:
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