1. General description
The 74ALVCH16501 is an 18-bit universal transceiver with bus hold inputs and 3-state outputs.
Data flow in each direction is controlled by output enable (OEAB and OEBA), latch enable (LEAB
and LEBA), and clock (CPAB and CPBA) inputs. For A-to-B data flow, the device operates in the
transparent mode when LEAB is HIGH. When LEAB is LOW, the A data is latched if CPAB is held
at a HIGH or LOW logic level. If LEAB is LOW, the A-bus data is stored in the latch/flip-flop on the
LOW-to-HIGH transition of CPAB. When OEAB is HIGH, the outputs are active. When OEAB is
LOW, the outputs are in the high-impedance state. Data flow for B-to-A is similar to that of A-to-B
but uses OEBA, LEBA and CPBA. The output enables are complimentary (OEAB is active HIGH
and OEBA is active LOW). This device is fully specified for partial power down applications using
IOFF. The IOFF circuitry disables the output, preventing the potentially damaging backflow current
through the device when it is powered down.
2. Features and benefits
• Wide supply voltage range from 1.2 V to 3.6 V
• CMOS low power dissipation
• Direct interface with TTL levels
• Current drive ±24 mA at VCC = 3.0 V
• Universal bus transceiver with D-type latches and D-type flip-flops capable of operating in
transparent, latched or clocked mode
• Bus hold on all data inputs
• Output drive capability 50 Ω transmission lines at 85 °C
• 3-state non-inverting outputs for bus-oriented applications
• Latch-up performance exceeds 100 mA per JESD78 Class II Level B
• Complies with JEDEC standards:
• JESD8-7 (1.65 V to 1.95 V)
• JESD8-5 (2.3 V to 2.7 V)
• JESD8C (2.7 V to 3.6 V)
• ESD protection:
• HBM JESD22-A114F exceeds 2000 V
• MM JESD22-A115-B exceeds 200 V
• Specified from -40 °C to +85 °C