
TLS2154, TLS2156, TLS2158
5-V THIN-FILM 4-, 6-, AND 8-CHANNEL
LOW-NOISE READ/WRITE PREAMPLIFIERS
SQHS006 – SEPTEMBER 1996
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
TLS21C(D)56
PIN NOMENCLATURE (DA PACKAGE)
TERMINAL
NAME
I/O
DESCRIPTION
NO.
CS
29
I
Chip select. High input selects idle mode.
GND
30
I
Ground
H0X
1
I/O
X-head connection. Write-head positive differential input.
H0Y
2
I/O
Y-head connection. Write-head negative differential input.
H1X
3
I/O
X-head connection. Write-head positive differential input.
H1Y
4
I/O
Y-head connection. Write-head negative differential input.
H2X
5
I/O
X-head connection. Write-head positive differential input.
H2Y
6
I/O
Y-head connection. Write-head negative differential input.
H3X
7
I/O
X-head connection. Write-head positive differential input.
H3Y
8
I/O
Y-head connection. Write-head negative differential input.
H4X
9
I/O
X-head connection. Write-head positive differential input.
H4Y
10
I/O
Y-head connection. Write-head negative differential input.
H5X
11
I/O
X-head connection. Write-head positive differential input.
H5Y
12
I/O
Y-head connection. Write-head negative differential input.
HS2, HS1,
HS0
22, 23,
24
I
Head select. Selects one of six heads. During servo-write mode, selects two, four, or
six heads.
NC
13, 14,
15, 16.
17, 31,
32
—
No internal connection
R/W
28
I
Read/write. High-level input selects read mode and a low-level input selects write
mode.
RDX, RDY
25, 26
O
Read data. Differential read-data output
VCC
21
I
Supply voltage
WCS
27
I
Write-current set. Used to set the magnitude of the write-current bias. Can be wire
ORed when more than one device is used.
WDY, WDX
19, 20
I
Write data. Pseudo ECL, differential data input
WUS/SE
18
I/O
Write unsafe. Indicates write current is zero, mode is read, WDX/WDY frequency is
low, device is not selected, head is shorted or open, or low VCC.
Servo enable. When SE = VCC + 1.9 V the servo-write head is turned on.