ISL32172E Datasheet, PDF (4/20 Pages) Intersil Corporation – QUAD, ±16.5kV ESD Protected, 3.0V to 5.5V, Low Power, RS-422 Transmitters

ISL32172E, ISL32272E, ISL32372E, ISL32174E, ISL32274E, ISL32374E, ISL32179E
Pin Descriptions
PIN
FUNCTION
EN, EN
Group driver output enables, that are internally pulled high to V_CC. All ISL32x72E driver outputs, Y and Z, are enabled by driving EN
high OR EN low, and the outputs are high impedance when EN is low AND EN is high (i.e., if using only the active high EN, connect
EN directly to V_CC or V_L; if using only the active low EN, connect EN directly to GND). On the ISL32179E accomplish group enable
by connecting all the ENX pins to V_CC or V_L, and then use the EN or EN pin as previously described. If the group driver enable
function isn’t required (see Note), connect EN to V_CC, or connect EN to GND. (ISL32x72E and ISL32179E only)
EN12,
EN34
Paired driver output enables, that are internally pulled high to V_CC. Driving EN12 (EN34) high enables Channel 1 and 2 (3 and 4)
outputs (Y and Z). Driving EN12 (EN34) low disables Channel 1 and 2 (3 and 4) outputs. If the driver enable function isn’t required
(see Note), connect EN12 and EN34 to V_CC. (ISL32x74E only)
ENx Individual driver output enables that are internally pulled high to V_CC. Forcing ENx high (along with EN high OR EN low) enables the
channel X outputs (Y and Z). Driving ENX low disables the Channel X outputs, regardless of the states of EN and EN. Connect both
EN and EN to V_CC for the lowest SHDN current if utilizing SHDN mode (see SHDNEN below). If the individual driver enable function
isn’t required (see Note), connect ENX to V_CC. (ISL32179E only)
SHDNEN Low power SHDN mode enable. A high level allows the ISL32179E to enter a low power mode when all channels are disabled. A low
level prevents the device from entering the low power mode. (ISL32179E only)
DIx Driver input. A low on DI forces the corresponding channel’s output Y low and output Z high. Similarly, a high on DI forces output Y
high and output Z low.
SPA, SPB Speed select inputs that are internally pulled-high. See ISL32179E Truth Table on page 3. (ISL32179E only)
GND Ground connection. This is also the potential of the QFN thermal pad.
Yx
±16.5kV IEC61000-4-2 ESD Protected RS-422 level, noninverting transmitter output.
Zx
±16.5kV IEC61000-4-2 ESD Protected RS-422 level, inverting transmitter output.
V_CC System power supply input (3.0V to 5.5V). On devices with a V_L pin, power-up V_CC first.
V_L
Logic power supply input. Connecting the V_L pin to the lower voltage power supply of a logic device (e.g., UART or µcontroller)
interfacing with the ISL32179E tailors its logic pin (DI, EN (all varieties), SHDNEN, and SP) V_IL/V_IH levels to values compatible with
the lower supply voltage. Power-up this supply after V_CC, and keep V_L ≤ V_CC. (ISL32179E only)
NOTE: Unused EN pins of any type should not be left floating, even though they have internal pull-ups.
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FN6824.0
December 16, 2008