AD261AND-4 Analog Devices Inc, AD261AND-4 Datasheet - Page 6

• Manufacturer Part Number: AD261AND-4
• Description: IC LOGIC ISO/1.75KV 4:1IO 22DIP
• Manufacturer: Analog Devices Inc
• Series: IsoLogic™r

Specifications of AD261AND-4

• Rohs Status: RoHS non-compliant
• Inputs - Side 1/side 2: 2/3
• Number Of Channels: 5
• Isolation Rating: 375Vrms
• Voltage - Supply: 4 V ~ 5.75 V
• Data Rate: 40MBd
• Propagation Delay: 14ns
• Output Type: Tri-State
• Package / Case: 22-DIP Module
• Operating Temperature: -25°C ~ 85°C

AD261
Logic information is sent across the barrier as “set-hi/set-lo”
data that is derived from logic level transitions of the input. At
power-up or after a fault condition, an output might not repre-
sent the state of the respective channel input to the isolator. An
internal circuit operates in the background which interrogates
all inputs about every 5 s and in the absence of logic transi-
tions, sends appropriate “set-hi” or “set-lo” data across the
barrier.
Recovery time from a fault condition or at power-up is thus
between 5 s and 10 s.
INPUT
OUTPUT
EFFECTIVE
CIRCUIT
MODEL
63%
CAPACITANCE
0.160 (4.06)
0.140 (3.56)
0.250
(6.35)
INPUT
0.075 (1.91)
*CREEPAGE PATH (SUBTRACT APPROXIMATELY
5pF
0.079 (2mm) FOR SOLDER PAD RADII ON PC BOARD.
THIS SPACING SUPPORTS THE INTRINSICALLY SAFE
RATING OF 750V.
Figure 2. Typical Timing and Delay Models
1
SYSTEM
0.050 (1.27)
t
TOTAL DELAY =
PIN 1
rr
BUFFER
=
Dimensions shown in inches and (mm).
t
8
ff
PROPAGATION DELAY
OUTLINE DIMENSIONS
= 100
1.500 (38.1) MAX
0.738* (18.75)
0.650 (16.51)
SIDE VIEW
= 5.5ns INTO 50pF
BOTTOM
t
22-Pin Plastic DIP
0.5ns – NO LOAD
PD
VIEW
x C
= 14ns
DELAY LINE
t
PD
(ND-22A)
TOTAL OUTPUT CAPACITANCE
14ns
–6–
t
(0.508
rr
15
0.020
16 PLACES
= 13ns (NO LOAD), 18ns (50pF LOAD)
ENABLE
DATA IN
FIELD
0.010
0.254)
BUFFER
22
(11.18)
SCHMITT
TRIGGER
0.440
MAX
BUFFER
0.100
(2.54)
0.050
(1.27)
Figure 1. Simplified Block Diagram
TRANSPARENT
NEGATIVE GOING
INPUT THRESHOLD
POSITIVE GOING
INPUT THRESHOLD
t
100
ff
GATED
LATCH
0.550 (13.97)
END VIEW
D Q
G
MAX
0.350
(8.89)
DRIVER
5pF
OUTPUT
CAPACITANCE
ISOLATION
BARRIER
HYSTERESIS
CONTINUOUS
UPDATE CIRCUIT
37%
3.5kV
RECEIVER
DATA
OUTPUT
BUFFER
REV. 0
OUT
ENABLE