CT2500 datasheet(2/10 Pages) AEROFLEX

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SCDCT2500 REV A 6/12/98 Plainview NY (516) 694-6700

I/O CONTROL

The CT2500 is very flexible in it’s I/O architecture.

The unit can handle 16 bit and 32 bit data and

command word loading. In addition, data words can

be preloaded into an external FIFO and the unit will

load data words from the FIFO directly without

subsystem intervention. Similarly, data can be

received and automatically loaded into a FIFO. This

frees up the subsystem until the data transfer is

complete. These options are desirable especially

when operating under burst mode transmissions.

Control frames are sent by strobing LDCNTRL and

data is sent by strobing STR2.

DATA TRANSFERS

The CT2500 is built to send and receive Type D

and E Control frames. It can transmit and receive

32-bit

command

and

data

word.

All

32-bit

communications are double buffered for maximum

flexibility. This allows the subsystem to respond with

less critical timing constraints. Burst mode data

transmission can be initiated by setting the "Burst

Mode" pin high. Automatic FIFO operation is

enabled by setting "FIFOEN" pin high. The serial

data out is automatically formatted for the CT1698 to

send out along the cable.

SOURCE AND SINK MODES

Both Source and Sink Mode operations are

available in the CT2500. Selection of modes is

accomplished through the Source/Sink pin. In the

Source Mode, the unit will transmit control frames,

32 bit command and data words including burst

mode data. It will receive control frames only. In Sink

Mode, the unit will transmit control frames only and

receive control frames, 32 bit command and data

words, and burst mode data.

SYSTEM INTEGRITY FEATURES

The CT2500 has built in system integrity features.

The unit can generate and send parity with all 32 bit

transmissions. For reception of 32 bit words, the unit

can check for parity, frame, overrun, sync, and bit

count errors.

ELECTRICAL CHARACTERISTICS

(VDD = 5V ±10%, TC = -55 °C to +125°C, unless otherwise specified)

SYMBOL

PARAMETER

LIMIT

IDD

Quiescent current

100uA max

PDS

Power Dissipation

200mW max

Iin

Input leakage

10uA max

Ioz

Tri-state leakage

10uA max

VIH

Input high level

2.0V min

VIL

Input low level

0.8V max

VOH

Output high level

2.4V min @ IOH = -4mA

VOL

Output low level

0.4V max @ IOL = 4mA

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