SI8450 Datasheet, PDF (21/36 Pages) List of Unclassifed Manufacturers – LOW POWER FIVE-CHANNEL DIGITAL ISOLATOR

Si8450/51/52/55
Table 13. Enable Input Truth Table¹
P/N
EN1^1,2 EN2^1,2
Operation
Si8450
—
H Outputs B1, B2, B3, B4, B5 are enabled and follow input state.
—
L Outputs B1, B2, B3, B4, B5 are disabled and Logic Low or in high impedance
state.³
Si8451
H
X Output A5 enabled and follow input state.
L
X Output A5 disabled and Logic Low or in high impedance state.³
X
H Outputs B1, B2, B3, B4 are enabled and follow input state.
d X
L Outputs B1, B2, B3, B4 are disabled and Logic Low or in high impedance state.³
e ^Si8452
H
X Outputs A4 and A5 are enabled and follow input state.
d ^L
X Outputs A4 and A5 are disabled and Logic Low or in high impedance state.³
n ^X
H Outputs B1, B2, B3 are enabled and follow input state.
e ^{s X}
L Outputs B1, B2, B3 are disabled and Logic Low or in high impedance state.³
n _Si8455
—
— Outputs B1, B2, B3, B4, B5 are enabled and follow input state.
m ig Notes:
1. Enable inputs EN1 and EN2 can be used for multiplexing, for clock sync, or other output control. These inputs are
m ^{s internally pulled-up to local VDD by a 3 µA current source allowing them to be connected to an external logic level (high}
o ^{e or low) or left floating. To minimize noise coupling, do not connect circuit traces to EN1 or EN2 if they are left floating. If}
EN1, EN2 are unused, it is recommended they be connected to an external logic level, especially if the Si845x is
operating in a noisy environment.
c ^D _{2. X = not applicable; H = Logic High; L = Logic Low.}
3. When using the enable pin (EN) function, the output pin state is driven to a logic low state when the EN pin is disabled
e _{(EN = 0) in Revision A. Revision B outputs go into a high-impedance state when the EN pin is disabled (EN = 0). See}
Not ^{Rfor New "3. Errata and Design Migration Guidelines" on page 26 for more details.}
Rev. 1.5
21