AM386SX datasheet(14/30 Pages) AMD

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Am386SX/SXL/SXLV Microprocessors Data Sheet

FINAL

SWITCHING CHARACTERISTICS

The switching characteristics given consist of output

delays, input setup requirements, and input hold re-

quirements. All switching characteristics are relative to

the CLK2 rising edge crossing the 2.0-V level.

Switching characteristic measurement is defined in

Figure 2. Inputs must be driven to the voltage levels in-

dicated by Figure 2 when switching characteristics are

measured. Output delays are specified with minimum

and maximum limits measured, as shown. The mini-

mum delay times are hold times provided to external

circuitry. Input setup and hold times are specified as

minimums, defining the smallest acceptable sampling

window. Within the sampling window, a synchronous

input signal must be stable for correct operation.

Outputs ADS, W/R, D/C, M/IO, LOCK, BHE, BLE,

A23–A1, HLDA, and SMIADS* only change at the be-

ginning of phase one. D15–D0 and SMI* write cycles

only change at the beginning of phase two. The

READY, HOLD, BUSY, ERROR, PEREQ, FLT, D15–

D0, IIBEN*, and SMIRDY* read cycles inputs are sam-

pled at the beginning of phase one. The NA, INTR,

NMI, and SMI* inputs are sampled at the beginning of

phase two.

* –

On Am386SXLV only; NC on Am386SX/SXL

Figure 2. Drive Levels and Measurement Points for Switching Characteristics

Valid

Output n

Valid

Output n+1

Valid

Input

Valid

Output n

Valid

Output n+1

Valid

Input

Max

Min

Max

Min

2 V

CLK2

(A23–A1, BHE, BLE,

ADS, M/IO, D/C,

W/R, LOCK, HLDA,

SMIADS*)

(NA, INTR, NMI, SMI*)

(READY, HOLD,

FLT, ERROR, BUSY,

PEREQ, D15–D0,

IIBEN*, SMIRDY*)

Legend: A–Maximum Output Delay Characteristic

B–Minimum Output Delay Characteristic

C–Minimum Input Setup Characteristic

D–Minimum Input Hold Characteristic

16305C–003

(D15–D0, SMI*)

Notes:

1. Input waveforms have tr

≤ 2.0 ns from 0.8 V–2.0 V (on Am386SXLV only).

2. On Am386SX/SXL, VT = 1.5; on Am386SXLV, VT = 1.0 V for VCC ≤ 3.6 V and 1.5 V for VCC > 3.6 V.

3. * = On Am386SXLV only.

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