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SCES636B AUGUST 2005 – April 2015 SN74LVC16T245

PRODUCTION DATA.

封装选项

请参考 PDF 数据表获取器件具体的封装图。

机械数据 (封装 | 引脚)

DGG|48
DL|48
DGV|48

散热焊盘机械数据 (封装 | 引脚)

订购信息

9 Detailed Description

9.1 Overview

The SN74LVC16T245 is a 16-bit, dual-supply noninverting bidirectional voltage level translation. Pins A and control pins (DIR and OE) are supported by V_CCA and pins B are supported by V_CCB. The A port is able to accept I/O voltages ranging from 1.65 V to 5.5 V, while the B port can accept I/O voltages from 1.65 V to 5.5 V. A high on DIR allows data transmission from A to B and a low on DIR allows data transmission from B to A when OE is set to low. When OE is set to high, both A and B are in the high-impedance state.

This device is fully specified for partial-power-down applications using off output current (I_off).

The V_CC isolation feature ensures that if either V_CC input is at GND, both ports are put in a high-impedance state.

9.2 Functional Block Diagram

9.3 Feature Description

9.3.1 Fully Configurable Dual-Rail Design Allows Each Port to Operate Over the Full 1.65-V to 5.5-V Power-Supply Range

Both V_CCA and V_CCB can be supplied at any voltage from 1.65 V to 5.5 V making the device suitable for translating between any of the low voltage nodes (1.8-V, 2.5-V, and 3.3-V).

9.3.2 Support High-Speed Translation

SN74LVC16T245 can support high data rate application. Data rates can be calculated form the maximum propagation delay. This is also dependant on the output load. For example, for a 3.3-V to 5-V conversion, the maximum frequency is 200 MHz.

9.3.3 Partial-Power-Down Mode Operation

This device is fully specified for partial-power-down applications using off output current (I_off). I_off will prevent backflow current by disabling I/O output circuits when device is in partial power-down mode.

9.3.4 V_CC Isolation

The V_CC isolation feature ensures that if either V_CCA or V_CCB are at GND, both ports will be in a high-impedance state (I_OZ shown in Electrical Characteristics). This prevents false logic levels from being presented to either bus.

9.4 Device Functional Modes

The functional modes for the SN74LVC16T245 device are shown in Table 1.

Table 1. Function Table⁽¹⁾
(Each Transceiver)

CONTROL INPUTS		OUTPUT CIRCUITS		OPERATION
OE	DIR	A PORT	B PORT	OPERATION
L	L	Enabled	Hi-Z	B data to A bus
L	H	Hi-Z	Enabled	A data to B bus
H	X	Hi-Z	Hi-Z	Isolation

(1) Input circuits of the data I/Os always are active.