CT2565 datasheet(3/31 Pages) AEROFLEX

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SCDCT2565 REV B 8/10/99 Plainview NY (516) 694-6700

GENERAL

The CT2565 uses a custom CMOS ASIC for

protocol logic and I/O buffering to provide low

power dissipation in its small package.

The CT2565 performs a continuous on-line

Built-In-Test (BIT); in this test the last transmitted

word of each message transfer is wrapped

around through the active receiver channel and

verified against the captured encoded word. A

user-defined loop test under subsystem control

can also be implemented. Numerous error flags

are

provided

the

subsystem

including

message error, status error, response time out

and loop test error.

An external 12 MHz, TTL clock connected to Pin

39 is required.

Where appropriate, references to signal names

and their associated pin numbers for the 78 pin

DDIP

package

are

made

throughout

this

document. For flatpack model pin numbers, refer

to Table 10.

BC/RTU/MT Initialization

The

CT2565

provides

BC,

RTU,

and

operating

modes.

The

operating

mode

dynamically selectable through two static control

inputs as listed in Table 2. It is recommended

that a master RESET signal be issued (80ns min)

prior to mode selection to clear the internal

registers.

MIL-STD-1553 Word Types

Figure 2 illustrates the three MIL-STD-1553 word

types: Command, Data, and Status.

Values at nominal Power Supply Voltages unless otherwise specified

PARAMETER

VALUE

UNITS

Logic

VIH

2.0 min

VIL

0.8 max

VOH

3.7 min

VOL

0.4 max

IIH

±100 max

µA

IIL

-0.4 max

IOL *

±1.2 max

IOH *

±0.4 max

CIN (f = 1MHz)

20 max

COUT (f = 1MHz)

20 max

Power Supply

+5VDC

Tolerances

±10 max

Supply Current

50 typ (70 max)

Internal Decoupling

1.5 typ

µF

Temperature Range

Operating (Case)

−55 to +125

°C

Storage

−65 to +150

°C

Physical Characteristics

Size

78 pin DDIP

1.9 x 2.10 x 0.25

(48.30 x 53.34 x 6.35)

(mm)

82 pin flatpack

1.6 x 2.19 x 0.15

(40.64 x 55.63 x 3.81)

(mm)

Weight

1.7 (48)

oz (g)

* IOL and IOH parameters are indicated for all logic outputs except Data Bus (DB0 – DB15) which are ±5mA for

both parameters.

Table 1 – CT2565 Specifications

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