HI-6120 HOLTIC [Holt Integrated Circuits], HI-6120 Datasheet - Page 15

• Manufacturer Part Number: HI-6120
• Description: MIL-STD-1553 Remote Terminal ICs
• Manufacturer: HOLTIC [Holt Integrated Circuits]

(HI-6121PQX
variant only)
ACKINT
SCK
Pin
SO
SI
Function
OUTPUT
INPUT
INPUT
INPUT
Description
Serial Peripheral Interface (SPI) Serial Output pin. SO is normally connected to
MISO (Master In - Slave Out) pin on host SPI port. The SO pin is tri-stated when
not transmitting serial data to host.
Serial Peripheral Interface (SPI) Serial Input pin. Internal 50KΩ pull-down resistor.
SI is normally connected to MOSI (Master Out - Slave In) pin on host SPI port.
Serial Peripheral Interface (SPI) Serial Clock pin. Internal 50KΩ pull-down resis-
tor. SCK is normally connected to SCK output pin on host SPI port.
Interrupt Acknowledge, active high. Internal 50KΩ pull-down resistor. This input is
only used when the INTSEL bit in Configuration Register 1 is asserted to enable
level interrupts. After interrupt assertion causes the INTHW or INTMES output
to go low, a high state (60ns minimum duration) on ACKINT will clear the INTHW
or INTMES output to logic 1. Interrupt outputs on INTHW and INTMES are also
cleared by reading the Pending Interrupt Register.
Table 3. Pin Descriptions (HI-6121 only)
HOLT INTEGRATED CIRCUITS
HI-6120, HI-6121
15