CSP1027 datasheet(55/64 Pages) AGERE

55 / 64 page

Lucent Technologies Inc.

Data Sheet

CSP1027 Voice Band Codec for

December 1999

Cellular Handset and Modem Applications

11 Timing Characteristics and Requirements

The following timing characteristics and requirements are preliminary information and are subject to change. Tim-

ing characteristics refer to the behavior of the device under specified conditions. Timing requirements refer to con-

ditions imposed on the user for proper operation of the device. All timing data is valid for the following conditions:

TA = –40 °C to +85 °C or 0 °C to 70 °C (See Section 8.2 on page 47.)

VDD = 5 V ± 0.5 V, 3.3 V ± 0.3 V, or 3.0 V ± 0.3 V, VSS = 0 V (See Section 8.2 on page 47.)

Capacitance load on outputs (CL) = 50 pF

Output characteristics can be derated as a function of load capacitance (CL).

All outputs: dt/dCL

≤ 0.06 ns/pF for 0 ≤ CL ≤ 100 pF at VIH for rising edge

dt/dCL

≤ 0.05 ns/pF for 0 ≤ CL ≤ 100 pF at VIL for falling edge

For example, if the actual load capacitance is 30 pF instead of 50 pF, the derating for a rising edge is

(30 pF – 50 pF) x 0.06 ns/pF = 1.2 ns less than the specified rise time or delay which includes a rise time.

Test conditions for inputs:

Rise and fall times of 4 ns or less

Timing reference levels for delays = VIH, VIL

Test conditions for outputs:

CLOAD = 50 pF

Timing reference levels for delays = VIH, VIL

3-state delays measured to the high-impedance state of the output driver

CSP1027 Datasheet(PDF) 55 Page - Agere Systems