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SN74ABTH32318PN Datenblatt(PDF) 2 Page - Texas Instruments

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Teilenummer SN74ABTH32318PN
Bauteilbeschribung  18-BIT TRI-PORT UNIVERSAL BUS EXCHANGERS
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Hersteller  TI [Texas Instruments]
Direct Link  http://www.ti.com
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SN74ABTH32318PN Datenblatt(HTML) 2 Page - Texas Instruments

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SN54ABTH32318, SN74ABTH32318
18-BIT TRI-PORT UNIVERSAL BUS EXCHANGERS
SCBS180E – JUNE 1992 – REVISED MAY 1997
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
SN54ABTH32318 ...HT PACKAGE
(TOP VIEW)
23 24
C8
C7
C6
GND
C5
C4
C3
C2
C1
VCC
NC
GND
B18
B17
B16
B15
B14
GND
B13
B12
B11
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
25
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
A2
A3
A4
GND
A5
A6
A7
A8
A9
VCC
NC
GND
A10
A11
A12
A13
A14
GND
A15
A16
A17
26 27 28 29
83 82 81 80 79
84
78
76 75 74
77
30 31 32 33 34
73 72
22
71 70 69 68
35 36 37 38 39 40 41 42
67 66 65 64
NC – No internal connection
description
The ’ABTH32318 consist 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.
When VCC is between 0 and 2.1 V, the device is in the high-impedance state during power up or power down.
However, to ensure the high-impedance state above 2.1 V, 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.


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