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FUNCTIONAL DESCRIPTION

SN74GTLPH1616

17-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE UNIVERSAL BUS TRANSCEIVER

WITH BUFFERED CLOCK OUTPUTS

SCES346C – JANUARY 2001 – REVISED DECEMBER 2005

The SN74GTLPH1616 is a high-drive (100 mA), 17-bit UBT transceiver containing D-type latches and D-type

flip-flops for data-path operation in transparent, latched, clocked, or clock-enabled modes, and can replace any

of the functions shown in Table 1. Data polarity is noninverting.

Table 1. SN74GTLPH1616 UBT Transceiver Replacement Functions

FUNCTION

8 BIT

9 BIT

10 BIT

16 BIT

18 BIT

Transceiver

'245, '623, '645

'863

'861

'16245, '16623

'16863

Buffer/driver

'241, '244, '541

'827

'16241, '16244, '16541

'16825

Latched transceiver

'543

'16543

'16472

Latch

'373, '573

'843

'841

'16373

'16843

Registered transceiver

'646, '652

'16646, '16652

'16474

Flip-flop

'374, '574

'821

'16374

Standard UBT

'16500, '16501

Universal bus driver

'16835

Registered transceiver with clock enable

'2952

'16470, '16952

Flip-flop with clock enable

'377

'823

'16823

Standard UBT with clock enable

'16600, '16601

SN74GTLPH1616 UBT transceiver replaces all above functions

Additionally, the device allows for transparent conversion of CLKAB-to-GTLP signal levels (CLKOUT) and

CLKOUT-to-LVTTL logic levels (CLKIN).

Data flow in each direction is controlled by clock enables (CEAB and CEBA), latch enables (LEAB and LEBA),

clock (CLKAB and CLKBA), and output enables (OEAB and OEBA). CEAB and CEBA enable all 17 bits, and

OEAB and OEBA control the 17 bits of data and the CLKOUT/CLKIN buffered clock path for the A-to-B and

B-to-A directions, respectively.

For A-to-B data flow, when CEAB is low, the device operates on the low-to-high transition of CLKAB for the

flip-flop and on the high-to-low transition of LEAB for the latch path, i.e., if CEAB and LEAB are low, the A data is

latched, regardless of the state of CLKAB (high or low) and if LEAB is high, the device is in transparent mode.

When OEAB is low, the outputs are active. When OEAB is high, the outputs are in the high-impedance state.

The data flow for B to A is similar to A to B, except CEBA, OEBA, LEBA, and CLKBA are used.

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