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参数资料
| 型号： | SN74ABT32318PNR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 总线收发器 |
| 英文描述： | ABT SERIES, 18-BIT EXCHANGER, TRUE OUTPUT, PQFP80 |
| 封装： | PLASTIC, QFP-80 |
| 文件页数： | 2/9页 |
| 文件大小： | 152K |
| 代理商： | SN74ABT32318PNR |
SN54ABT32318, SN74ABT32318
18BIT TRIPORT UNIVERSAL BUS EXCHANGERS
SCBS180A JUNE 1992 REVISED JULY 1994
52
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 772511443
description
The
′ABT32318 consists of three 18-bit registered input/output (I/O) ports. These registers combine D-type
latches and flip-flops to allow data flow in transparent, latch, and clock modes. Data from one input port can be
exchanged to one or more of the other ports. Because of the universal storage element, multiple combinations
of real-time and stored data can be exchanged among the three ports.
Data flow in each direction is controlled by the output-enable (OEA, OEB, and OEC), select-control (SELA,
SELB, and SELC), latch-enable (LEA, LEB, and LEC), and clock (CLKA, CLKB, and CLKC) inputs. The A data
register operates in the transparent mode when LEA is high. When LEA is low, data is latched if CLKA is held
at a high or low logic level. If LEA is low, data is stored on the low-to-high transition of CLKA. Output data
selection is accomplished by the select-control pins. All three ports have active-low output enables, so when
the output-enable input is low, the outputs are active; when the output-enable input is high, the outputs are in
the high-impedance state.
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.
The SN54ABT32318 is characterized for operation over the full military temperature range of 55
°C to 125°C.
The SN74ABT32318 is characterized for operation from 40
°C to 85°C.
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